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Li Y, Liu C, Zheng H, Jiang JS, Zhu Z, Yan X, Cao H, Narayanachari KVLV, Paudel B, Koirala KP, Zhang Z, Fisher B, Wang H, Karapetrova E, Sun C, Kelly S, Phelan D, Du Y, Buchholz B, Mitchell JF, Bhattacharya A, Fong DD, Zhou H. On the Topotactic Phase Transition Achieving Superconducting Infinite-Layer Nickelates. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2402484. [PMID: 39219216 DOI: 10.1002/adma.202402484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2024] [Revised: 06/05/2024] [Indexed: 09/04/2024]
Abstract
Topotactic reduction is critical to a wealth of phase transitions of current interest, including synthesis of the superconducting nickelate Nd0.8Sr0.2NiO2, reduced from the initial Nd0.8Sr0.2NiO3/SrTiO3 heterostructure. Due to the highly sensitive and often damaging nature of the topotactic reduction, however, only a handful of research groups have been able to reproduce the superconductivity results. A series of in situ synchrotron-based investigations reveal that this is due to the necessary formation of an initial, ultrathin layer at the Nd0.8Sr0.2NiO3 surface that helps to mediate the introduction of hydrogen into the film such that apical oxygens are first removed from the Nd0.8Sr0.2NiO3 / SrTiO3 (001) interface and delivered into the reducing environment. This allows the square-planar / perovskite interface to stabilize and propagate from the bottom to the top of the film without the formation of interphase defects. Importantly, neither geometric rotations in the square planar structure nor significant incorporation of hydrogen within the films is detected, obviating its need for superconductivity. These findings unveil the structural basis underlying the transformation pathway and provide important guidance on achieving the superconducting phase in reduced nickelate systems.
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Affiliation(s)
- Yan Li
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Changjiang Liu
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Hong Zheng
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Jidong Samuel Jiang
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Zihua Zhu
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Xi Yan
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Hui Cao
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - K V L V Narayanachari
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Binod Paudel
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Krishna Prasad Koirala
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Zhan Zhang
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Brandon Fisher
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Huanhua Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Evguenia Karapetrova
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Chengjun Sun
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Shelly Kelly
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Daniel Phelan
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Yingge Du
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Bruce Buchholz
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - J F Mitchell
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Anand Bhattacharya
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Dillon D Fong
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Hua Zhou
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
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2
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Liu Z, Huo M, Li J, Li Q, Liu Y, Dai Y, Zhou X, Hao J, Lu Y, Wang M, Wen HH. Electronic correlations and partial gap in the bilayer nickelate La 3Ni 2O 7. Nat Commun 2024; 15:7570. [PMID: 39217168 PMCID: PMC11365989 DOI: 10.1038/s41467-024-52001-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 08/21/2024] [Indexed: 09/04/2024] Open
Abstract
The discovery of superconductivity with a critical temperature of about 80 K in La3Ni2O7 single crystals under pressure has received enormous attention. La3Ni2O7 is not superconducting under ambient pressure but exhibits a transition at T ∗ ≃ 115 K. Understanding the electronic correlations and charge dynamics is an important step towards the origin of superconductivity and other instabilities. Here, our optical study shows that La3Ni2O7 features strong electronic correlations which significantly reduce the electron's kinetic energy and place this system in the proximity of the Mott phase. The low-frequency optical conductivity reveals two Drude components arising from multiple bands at the Fermi level. The transition at T ∗ removes the Drude component exhibiting non-Fermi liquid behavior, whereas the one with Fermi-liquid behavior is barely affected. These observations in combination with theoretical results suggest that the Fermi surface dominated by the Ni-d 3 z 2 - r 2 orbital is removed due to the transition at T ∗. Our experimental results provide pivotal information for understanding the transition at T ∗ and superconductivity in La3Ni2O7.
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Affiliation(s)
- Zhe Liu
- National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Mengwu Huo
- Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou, Guangdong, 510275, China
| | - Jie Li
- National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Qing Li
- National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Yuecong Liu
- National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Yaomin Dai
- National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
| | - Xiaoxiang Zhou
- National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Jiahao Hao
- National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Yi Lu
- National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
| | - Meng Wang
- Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou, Guangdong, 510275, China.
| | - Hai-Hu Wen
- National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
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3
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Balakrishnan PP, Ferenc Segedin D, Chow LE, Quarterman P, Muramoto S, Surendran M, Patel RK, LaBollita H, Pan GA, Song Q, Zhang Y, El Baggari I, Jagadish K, Shao YT, Goodge BH, Kourkoutis LF, Middey S, Botana AS, Ravichandran J, Ariando A, Mundy JA, Grutter AJ. Extensive hydrogen incorporation is not necessary for superconductivity in topotactically reduced nickelates. Nat Commun 2024; 15:7387. [PMID: 39191732 DOI: 10.1038/s41467-024-51479-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Accepted: 08/07/2024] [Indexed: 08/29/2024] Open
Abstract
A key open question in the study of layered superconducting nickelate films is the role that hydrogen incorporation into the lattice plays in the appearance of the superconducting state. Due to the challenges of stabilizing highly crystalline square planar nickelate films, films are prepared by the deposition of a more stable parent compound which is then transformed into the target phase via a topotactic reaction with a strongly reducing agent such as CaH2. Recent studies, both experimental and theoretical, have introduced the possibility that the incorporation of hydrogen from the reducing agent into the nickelate lattice may be critical for the superconductivity. In this work, we use secondary ion mass spectrometry to examine superconducting La1-xXxNiO2 / SrTiO3 (X = Ca and Sr) and Nd6Ni5O12 / NdGaO3 films, along with non-superconducting NdNiO2 / SrTiO3 and (Nd,Sr)NiO2 / SrTiO3. We find no evidence for extensive hydrogen incorporation across a broad range of samples, including both superconducting and non-superconducting films. Theoretical calculations indicate that hydrogen incorporation is broadly energetically unfavorable in these systems, supporting our conclusion that extensive hydrogen incorporation is not generally required to achieve a superconducting state in layered square-planar nickelates.
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Affiliation(s)
- Purnima P Balakrishnan
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
| | | | - Lin Er Chow
- Department of Physics, Faculty of Science, National University of Singapore, Singapore, 117551, Singapore
| | - P Quarterman
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - Shin Muramoto
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - Mythili Surendran
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089, USA
- Core Center for Excellence in Nano Imaging, University of Southern California, Los Angeles, CA, 90089, USA
| | - Ranjan K Patel
- Department of Physics, Indian Institute of Science, Bengaluru, 560012, India
| | | | - Grace A Pan
- Department of Physics, Harvard University, Cambridge, MA, 02138, USA
| | - Qi Song
- Department of Physics, Harvard University, Cambridge, MA, 02138, USA
| | - Yang Zhang
- The Rowland Institute at Harvard, Harvard University, Cambridge, MA, 02138, USA
| | - Ismail El Baggari
- The Rowland Institute at Harvard, Harvard University, Cambridge, MA, 02138, USA
| | - Koushik Jagadish
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089, USA
| | - Yu-Tsun Shao
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089, USA
- Core Center for Excellence in Nano Imaging, University of Southern California, 925 Bloom Walk, Los Angeles, CA, 90089, USA
| | - Berit H Goodge
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY, 14853, USA
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Lena F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY, 14853, USA
| | - Srimanta Middey
- Department of Physics, Indian Institute of Science, Bengaluru, 560012, India
| | - Antia S Botana
- Department of Physics, Arizona State University, Tempe, AZ, 85287, USA
| | - Jayakanth Ravichandran
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089, USA.
- Core Center for Excellence in Nano Imaging, University of Southern California, Los Angeles, CA, 90089, USA.
- Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, 90089, USA.
| | - A Ariando
- Department of Physics, Faculty of Science, National University of Singapore, Singapore, 117551, Singapore.
| | - Julia A Mundy
- Department of Physics, Harvard University, Cambridge, MA, 02138, USA.
| | - Alexander J Grutter
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
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4
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Zhang R, Lane C, Nokelainen J, Singh B, Barbiellini B, Markiewicz RS, Bansil A, Sun J. Emergence of Competing Stripe Phases in Undoped Infinite-Layer Nickelates. PHYSICAL REVIEW LETTERS 2024; 133:066401. [PMID: 39178441 DOI: 10.1103/physrevlett.133.066401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 04/16/2024] [Accepted: 07/01/2024] [Indexed: 08/25/2024]
Abstract
Recent discovery of superconductivity in infinite-layer nickelates has ignited renewed theoretical and experimental interest in the role of electronic correlations in their properties. Here, using first-principles simulations, we show that the parent compound of the nickelate family, LaNiO_{2}, hosts competing low-energy stripe phases, similar to doped cuprates. The stripe states are shown to be driven by multiorbital electronic mechanisms and Peierls distortions. Our study indicates that both strong correlations and electron-phonon coupling effects play a key role in the physics of infinite-layer nickelates, and sheds light on the microscopic origin of electronic inhomogeneity and the lack of long-range order in the nickelates.
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Affiliation(s)
| | | | - Johannes Nokelainen
- Department of Physics, School of Engineering Science, LUT University, FI-53850 Lappeenranta, Finland
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
- Quantum Materials and Sensing Institute, Northeastern University, Burlington, Massachusetts 01803, USA
| | | | - Bernardo Barbiellini
- Department of Physics, School of Engineering Science, LUT University, FI-53850 Lappeenranta, Finland
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
- Quantum Materials and Sensing Institute, Northeastern University, Burlington, Massachusetts 01803, USA
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5
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Zeng S, Tang CS, Luo Z, Chow LE, Lim ZS, Prakash S, Yang P, Diao C, Yu X, Xing Z, Ji R, Yin X, Li C, Wang XR, He Q, Breese MBH, Ariando A, Liu H. Origin of a Topotactic Reduction Effect for Superconductivity in Infinite-Layer Nickelates. PHYSICAL REVIEW LETTERS 2024; 133:066503. [PMID: 39178458 DOI: 10.1103/physrevlett.133.066503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Accepted: 06/25/2024] [Indexed: 08/25/2024]
Abstract
Topotactic reduction utilizing metal hydrides as reagents has emerged as an effective approach to achieve exceptionally low oxidization states of metal ions and unconventional coordination networks. This method opens avenues to the development of entirely new functional materials, with one notable example being the infinite-layer nickelate superconductors. However, the reduction effect on the atomic reconstruction and electronic structures-crucial for superconductivity-remains largely unresolved. We designed two sets of control Nd_{0.8}Sr_{0.2}NiO_{2} thin films and used secondary ion mass spectroscopy to highlight the absence of reduction-induced hydrogen intercalation. X-ray absorption spectroscopy revealed a significant linear dichroism with dominant Ni 3d_{x2-y2} orbitals on superconducting samples, indicating a Ni single-band nature of infinite-layer nickelates. Consistent with the superconducting T_{c}, the Ni 3d orbitals asymmetry manifests a domelike dependence on the reduction duration. Our results unveil the critical role of reduction in modulating the Ni-3d orbital polarization and its impact on the superconducting properties.
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6
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Liu Y, Meng Q, Mahmoudi P, Wang Z, Zhang J, Yang J, Li W, Wang D, Li Z, Sorrell C, Li S. Advancing Superconductivity with Interface Engineering. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2405009. [PMID: 39104281 DOI: 10.1002/adma.202405009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 07/01/2024] [Indexed: 08/07/2024]
Abstract
The development of superconducting materials has attracted significant attention not only for their improved performance, such as high transition temperature (TC), but also for the exploration of their underlying physical mechanisms. Recently, considerable efforts have been focused on interfaces of materials, a distinct category capable of inducing superconductivity at non-superconducting material interfaces or augmenting the TC at the interface between a superconducting material and a non-superconducting material. Here, two distinct types of interfaces along with their unique characteristics are reviewed: interfacial superconductivity and interface-enhanced superconductivity, with a focus on the crucial factors and potential mechanisms responsible for enhancing superconducting performance. A series of materials systems is discussed, encompassing both historical developments and recent progress from the perspectives of technical innovations and the exploration of new material classes. The overarching goal is to illuminate pathways toward achieving high TC, expanding the potential of superconducting parameters across interfaces, and propelling superconductivity research toward practical, high-temperature applications.
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Affiliation(s)
- Yichen Liu
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Qingxiao Meng
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Pezhman Mahmoudi
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Ziyi Wang
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Ji Zhang
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Jack Yang
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Wenxian Li
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Danyang Wang
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Zhi Li
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Chris Sorrell
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
| | - Sean Li
- UNSW Materials and Manufacturing Futures Institute, School of Materials Science and Engineering, The University of New South Wales, Kensington, NSW, 2052, Australia
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7
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Yan S, Mao W, Sun W, Li Y, Sun H, Yang J, Hao B, Guo W, Nian L, Gu Z, Wang P, Nie Y. Superconductivity in Freestanding Infinite-Layer Nickelate Membranes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2402916. [PMID: 38847344 DOI: 10.1002/adma.202402916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 06/01/2024] [Indexed: 06/19/2024]
Abstract
The observation of superconductivity in infinite-layer nickelates has attracted significant attention due to its potential as a new platform for exploring high-Tc superconductivity. However, thus far, superconductivity has only been observed in epitaxial thin films, which limits the manipulation capabilities and modulation methods compared to two-dimensional exfoliated materials. Given the exceptionally giant strain tunability and stacking capability of freestanding membranes, separating superconducting nickelates from the as-grown substrate is a novel way to engineer the superconductivity and uncover the underlying physics. Herein, this work reports the synthesis of the superconducting freestanding La0.8Sr0.2NiO2 membranes (T c zero = 10.6 K ${T}_{\mathrm{c}}^{\mathrm{zero}}\ =\ 10.6\ \mathrm{K}$ ), emphasizing the crucial roles of the interface engineering in the precursor phase film growth and the quick transfer process in achieving superconductivity. This work offers a new versatile platform for investigating superconductivity in nickelates, such as the pairing symmetry via constructing Josephson tunneling junctions and higher Tc values via high-pressure experiments.
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Affiliation(s)
- Shengjun Yan
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Wei Mao
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Wenjie Sun
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Yueying Li
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Haoying Sun
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Jiangfeng Yang
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Bo Hao
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Wei Guo
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Leyan Nian
- Suzhou Laboratory, Suzhou, 215125, P. R. China
| | - Zhengbin Gu
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Peng Wang
- Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom
| | - Yuefeng Nie
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
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8
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Ding X, Fan Y, Wang X, Li C, An Z, Ye J, Tang S, Lei M, Sun X, Guo N, Chen Z, Sangphet S, Wang Y, Xu H, Peng R, Feng D. Cuprate-like electronic structures in infinite-layer nickelates with substantial hole dopings. Natl Sci Rev 2024; 11:nwae194. [PMID: 39007006 PMCID: PMC11242455 DOI: 10.1093/nsr/nwae194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 05/10/2024] [Accepted: 05/13/2024] [Indexed: 07/16/2024] Open
Abstract
Superconducting infinite-layer (IL) nickelates offer a new platform for investigating the long-standing problem of high-temperature superconductivity. Many models were proposed to understand the superconducting mechanism of nickelates based on the calculated electronic structure, and the multiple Fermi surfaces and multiple orbitals involved create complications and controversial conclusions. Over the past five years, the lack of direct measurements of the electronic structure has hindered the understanding of nickelate superconductors. Here we fill this gap by directly resolving the electronic structures of the parent compound LaNiO2 and superconducting La0.8Ca0.2NiO2 using angle-resolved photoemission spectroscopy. We find that their Fermi surfaces consist of a quasi-2D hole pocket and a 3D electron pocket at the Brillouin zone corner, whose volumes change upon Ca doping. The Fermi surface topology and band dispersion of the hole pocket closely resemble those observed in hole-doped cuprates. However, the cuprate-like band exhibits significantly higher hole doping in superconducting La0.8Ca0.2NiO2 compared to superconducting cuprates, highlighting the disparities in the electronic states of the superconducting phase. Our observations highlight the novel aspects of the IL nickelates, and pave the way toward the microscopic understanding of the IL nickelate family and its superconductivity.
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Affiliation(s)
| | - Yu Fan
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Xiaoxiao Wang
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Chihao Li
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Zhitong An
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Jiahao Ye
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Shenglin Tang
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Minyinan Lei
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Xingtian Sun
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Nan Guo
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Zhihui Chen
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Suppanut Sangphet
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
| | - Yilin Wang
- School of Emerging Technology, University of Science and Technology of China, Hefei 230026, China
- New Cornerstone Science Laboratory, University of Science and Technology of China, Hefei 230026, China
| | - Haichao Xu
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Rui Peng
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Donglai Feng
- National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
- Advanced Materials Laboratory, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
- School of Emerging Technology, University of Science and Technology of China, Hefei 230026, China
- New Cornerstone Science Laboratory, University of Science and Technology of China, Hefei 230026, China
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9
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Zhao Q, Shao TN, Yang WL, Wang XY, Chen XY, Chen MH, Zhu FH, Chen CX, Dou RF, Xiong CM, Liu H, Nie JC. Isotropic Quantum Griffiths Singularity in Nd_{0.8}Sr_{0.2}NiO_{2} Infinite-Layer Superconducting Thin Films. PHYSICAL REVIEW LETTERS 2024; 133:036003. [PMID: 39094159 DOI: 10.1103/physrevlett.133.036003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 04/07/2024] [Accepted: 05/28/2024] [Indexed: 08/04/2024]
Abstract
This work reports on the emergence of quantum Griffiths singularity (QGS) associated with the magnetic field induced superconductor-metal transition (SMT) in unconventional Nd_{0.8}Sr_{0.2}NiO_{2} infinite layer superconducting thin films. The system manifests isotropic SMT features under both in-plane and perpendicular magnetic fields. Importantly, after scaling analysis of the isothermal magnetoresistance curves, the obtained effective dynamic critical exponents demonstrate divergent behavior when approaching the zero-temperature critical point B_{c}^{*}, identifying the QGS characteristics. Moreover, the quantum fluctuation associated with the QGS can quantitatively explain the upturn of the upper critical field around zero temperature for both the in-plane and perpendicular magnetic fields in the phase boundary of SMT. These properties indicate that the QGS in the Nd_{0.8}Sr_{0.2}NiO_{2} superconducting thin film is isotropic. Moreover, a higher magnetic field gives rise to a metallic state with the resistance-temperature relation R(T) exhibiting lnT dependence among the 2-10 K range and T^{2} dependence of resistance below 1.5 K, which is significant evidence of Kondo scattering. The interplay between isotropic QGS and Kondo scattering in the unconventional Nd_{0.8}Sr_{0.2}NiO_{2} superconductor can illustrate the important role of rare region in QGS and help to uncover the exotic superconductivity mechanism in this system.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Haiwen Liu
- School of Physics and Astronomy, Beijing Normal University, Beijing 100875, People's Republic of China
- Key Laboratory of Multiscale Spin Physics, Ministry of Education, Beijing Normal University, Beijing 100875, People's Republic of China
- Interdisciplinary Center for Theoretical Physics and Information Sciences, Fudan University, Shanghai 200433, People's Republic of China
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10
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Gao Q, Fan S, Wang Q, Li J, Ren X, Biało I, Drewanowski A, Rothenbühler P, Choi J, Sutarto R, Wang Y, Xiang T, Hu J, Zhou KJ, Bisogni V, Comin R, Chang J, Pelliciari J, Zhou XJ, Zhu Z. Magnetic excitations in strained infinite-layer nickelate PrNiO 2 films. Nat Commun 2024; 15:5576. [PMID: 38956078 PMCID: PMC11220032 DOI: 10.1038/s41467-024-49940-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 06/26/2024] [Indexed: 07/04/2024] Open
Abstract
Strongly correlated materials respond sensitively to external perturbations such as strain, pressure, and doping. In the recently discovered superconducting infinite-layer nickelates, the superconducting transition temperature can be enhanced via only ~ 1% compressive strain-tuning with the root of such enhancement still being elusive. Using resonant inelastic x-ray scattering (RIXS), we investigate the magnetic excitations in infinite-layer PrNiO2 thin films grown on two different substrates, namely SrTiO3 (STO) and (LaAlO3)0.3(Sr2TaAlO6)0.7 (LSAT) enforcing different strain on the nickelates films. The magnon bandwidth of PrNiO2 shows only marginal response to strain-tuning, in sharp contrast to the enhancement of the superconducting transition temperature Tc in the doped superconducting samples. These results suggest the bandwidth of spin excitations of the parent compounds is similar under strain while Tc in the doped ones is not, and thus provide important empirics for the understanding of superconductivity in infinite-layer nickelates.
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Affiliation(s)
- Qiang Gao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Shiyu Fan
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York, NY, 11973, USA
| | - Qisi Wang
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Jiarui Li
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Xiaolin Ren
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Izabela Biało
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland
- AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, 30-059, Kraków, Poland
| | - Annabella Drewanowski
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland
| | - Pascal Rothenbühler
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland
| | - Jaewon Choi
- Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom
| | - Ronny Sutarto
- Canadian Light Source, Saskatoon, Saskatchewan, S7N 2V3, Canada
| | - Yao Wang
- Department of Physics and Astronomy, Clemson University, Clemson, SC, 29631, USA
| | - Tao Xiang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
- Beijing Academy of Quantum Information Sciences, Beijing, 100193, China
| | - Jiangping Hu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ke-Jin Zhou
- Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom
| | - Valentina Bisogni
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York, NY, 11973, USA
| | - Riccardo Comin
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - J Chang
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland.
| | - Jonathan Pelliciari
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York, NY, 11973, USA.
| | - X J Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
- University of Chinese Academy of Sciences, Beijing, 100049, China.
- Songshan Lake Materials Laboratory, Dongguan, 523808, China.
| | - Zhihai Zhu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
- University of Chinese Academy of Sciences, Beijing, 100049, China.
- Songshan Lake Materials Laboratory, Dongguan, 523808, China.
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11
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Sun W, Wang Z, Hao B, Yan S, Sun H, Gu Z, Deng Y, Nie Y. In Situ Preparation of Superconducting Infinite-Layer Nickelate Thin Films with Atomically Flat Surface. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2401342. [PMID: 38754479 DOI: 10.1002/adma.202401342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 04/24/2024] [Indexed: 05/18/2024]
Abstract
Since their discovery, the infinite-layer nickelates have been regarded as an appealing system for gaining deeper insights into high-temperature superconductivity (HTSC). However, the synthesis of superconducting samples has been proven to be challenging. Here, an ultrahigh vacuum (UHV)in situ ${\mathrm{\text{in situ}}}$ reduction method is developed using atomic hydrogen as a reducing agent and is applied in the lanthanum nickelate system. The reduction parameters, including the reduction temperature (TR) and hydrogen pressure (PH), are systematically explored. It is found that the reduction window for achieving superconducting transition is quite wide, reaching nearly 80°C in TR and three orders of magnitude in PH when the reduction time is set to 30 min. And there exists an optimal PH for achieving the highest Tc if both TR and reduction time are fixed. More prominently, as confirmed by atomic force microscopy and scanning transmission electron microscopy, the atomically flat surface can be preserved during thein situ ${\mathrm{\text{in situ}}}$ reduction process, providing advantages over theex situ ${\mathrm{\text{ex situ}}}$ CaH2 method for surface-sensitive experiments.
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Affiliation(s)
- Wenjie Sun
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Zhichao Wang
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Bo Hao
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Shengjun Yan
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Haoying Sun
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Zhengbin Gu
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Yu Deng
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Yuefeng Nie
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, P. R. China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
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12
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Hu K, Li Q, Song D, Jia Y, Liang Z, Wang S, Du H, Wen HH, Ge B. Atomic scale disorder and reconstruction in bulk infinite-layer nickelates lacking superconductivity. Nat Commun 2024; 15:5104. [PMID: 38877022 PMCID: PMC11178912 DOI: 10.1038/s41467-024-49533-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 06/07/2024] [Indexed: 06/16/2024] Open
Abstract
The recent discovery of superconductivity in infinite-layer nickelate films has sparked significant interest and expanded the realm of superconductors, in which the infinite-layer structure and proper chemical doping are both of the essence. Nonetheless, the reasons for the absence of superconductivity in bulk infinite-layer nickelates remain puzzling. Herein, we investigate atomic defects and electronic structures in bulk infinite-layer Nd0.8Sr0.2NiO2 using scanning transmission electron microscopy. Our observations reveal the presence of three-dimensional (3D) block-like structural domains resulting from intersecting defect structures, disrupting the continuity within crystal grains, which could be a crucial factor in giving rise to the insulating character and inhibiting the emergence of superconductivity. Moreover, the infinite-layer structure, without complete topotactic reduction, retains interstitial oxygen atoms on the Nd atomic plane in bulk nickelates, possibly further aggravating the local distortions of NiO2 planes and hindering the superconductivity. These findings shed light on the existence of structural and atomic defects in bulk nickelates and provide valuable insights into the influence of proper topotactic reduction and structural orders on superconductivity.
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Affiliation(s)
- Kejun Hu
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui Key Laboratory of Magnetic Functional Materials and Devices, Institutes of Physical Science and Information Technology, Anhui University, Hefei, China
| | - Qing Li
- Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, China
| | - Dongsheng Song
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui Key Laboratory of Magnetic Functional Materials and Devices, Institutes of Physical Science and Information Technology, Anhui University, Hefei, China.
| | - Yingze Jia
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui Key Laboratory of Magnetic Functional Materials and Devices, Institutes of Physical Science and Information Technology, Anhui University, Hefei, China
| | - Zhiyao Liang
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui Key Laboratory of Magnetic Functional Materials and Devices, Institutes of Physical Science and Information Technology, Anhui University, Hefei, China
| | - Shuai Wang
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui Key Laboratory of Magnetic Functional Materials and Devices, Institutes of Physical Science and Information Technology, Anhui University, Hefei, China
| | - Haifeng Du
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei, China
| | - Hai-Hu Wen
- Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, China.
| | - Binghui Ge
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui Key Laboratory of Magnetic Functional Materials and Devices, Institutes of Physical Science and Information Technology, Anhui University, Hefei, China.
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13
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Gutiérrez‐Llorente A, Raji A, Zhang D, Divay L, Gloter A, Gallego F, Galindo C, Bibes M, Iglesias L. Toward Reliable Synthesis of Superconducting Infinite Layer Nickelate Thin Films by Topochemical Reduction. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2309092. [PMID: 38634748 PMCID: PMC11200026 DOI: 10.1002/advs.202309092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 03/05/2024] [Indexed: 04/19/2024]
Abstract
Infinite layer (IL) nickelates provide a new route beyond copper oxides to address outstanding questions in the field of unconventional superconductivity. However, their synthesis poses considerable challenges, largely hindering experimental research on this new class of oxide superconductors. That synthesis is achieved in a two-step process that yields the most thermodynamically stable perovskite phase first, then the IL phase by topotactic reduction, the quality of the starting phase playing a crucial role. Here, a reliable synthesis of superconducting IL nickelate films is reported after successive topochemical reductions of a parent perovskite phase with nearly optimal stoichiometry. Careful analysis of the transport properties of the incompletely reduced films reveals an improvement in the strange metal behavior of their normal state resistivity over subsequent topochemical reductions, offering insight into the reduction process.
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Affiliation(s)
- Araceli Gutiérrez‐Llorente
- Escuela Superior de Ciencias Experimentales y TecnologíaUniversidad Rey Juan CarlosMadrid28933Spain
- Laboratoire Albert Fert ‐ CNRS, ThalesUniversité Paris SaclayPalaiseau91767France
| | - Aravind Raji
- Laboratoire de Physique des Solides, CNRSUniversité Paris SaclayOrsay91405France
- Synchrotron SOLEIL, L'Orme des MerisiersBP 48 St AubinGif sur Yvette91192France
| | - Dongxin Zhang
- Laboratoire Albert Fert ‐ CNRS, ThalesUniversité Paris SaclayPalaiseau91767France
| | - Laurent Divay
- Thales Research & Technology FrancePalaiseau91767France
| | - Alexandre Gloter
- Laboratoire de Physique des Solides, CNRSUniversité Paris SaclayOrsay91405France
| | - Fernando Gallego
- Laboratoire Albert Fert ‐ CNRS, ThalesUniversité Paris SaclayPalaiseau91767France
| | | | - Manuel Bibes
- Laboratoire Albert Fert ‐ CNRS, ThalesUniversité Paris SaclayPalaiseau91767France
| | - Lucía Iglesias
- Laboratoire Albert Fert ‐ CNRS, ThalesUniversité Paris SaclayPalaiseau91767France
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14
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Yin H, Zhu H, Wang S, Jin K. Novel 2DEG System at the HfO 2/STO Interface. ACS APPLIED MATERIALS & INTERFACES 2024; 16:26915-26921. [PMID: 38717847 DOI: 10.1021/acsami.4c03115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2024]
Abstract
Multifunctional integration in a single device has always been a hot research topic, especially for contradictory phenomena, one of which is the coexistence of ferroelectricity and metallicity. The complex oxide heterostructures, as symmetric breaking systems, provide a great possibility to incorporate different properties. Moreover, finding a series of oxide heterostructures to achieve this goal remains as a challenge. Here, taking the advantage of different physical phenomena, we use H2 plasma to pretreat the SrTiO3 (STO) substrate and then fabricate HfO2/STO heterostructures with it. The novel, well-repeatable metallic two-dimensional electron gas (2DEG) is directly obtained at the heterointerfaces without any further complex procedures, while the obvious ferroelectric-like behavior and Rashba spin-orbit coupling are also observed. The understanding of the mechanism, as well as the modified facile preparation procedure, would be meaningful for further development of ferroelectric metal in complex oxide heterostructures.
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Affiliation(s)
- Hang Yin
- Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
| | - Huapei Zhu
- Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
| | - Shuanhu Wang
- Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
| | - Kexin Jin
- Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
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15
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Di Cataldo S, Worm P, Tomczak JM, Si L, Held K. Unconventional superconductivity without doping in infinite-layer nickelates under pressure. Nat Commun 2024; 15:3952. [PMID: 38729955 PMCID: PMC11087552 DOI: 10.1038/s41467-024-48169-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 04/22/2024] [Indexed: 05/12/2024] Open
Abstract
High-temperature unconventional superconductivity quite generically emerges from doping a strongly correlated parent compound, often (close to) an antiferromagnetic insulator. The recently developed dynamical vertex approximation is a state-of-the-art technique that has quantitatively predicted the superconducting dome of nickelates. Here, we apply it to study the effect of pressure in the infinite-layer nickelate SrxPr1-xNiO2. We reproduce the increase of the critical temperature (Tc) under pressure found in experiment up to 12 GPa. According to our results, Tc can be further increased with higher pressures. Even without Sr-doping the parent compound, PrNiO2, will become a high-temperature superconductor thanks to a strongly enhanced self-doping of the Nid x 2 - y 2 orbital under pressure. With a maximal Tc of 100 K around 100 GPa, nickelate superconductors can reach that of the best cuprates.
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Affiliation(s)
- Simone Di Cataldo
- Institut für Festkörperphysik, Technische Universität Wien, 1040, Wien, Austria.
| | - Paul Worm
- Institut für Festkörperphysik, Technische Universität Wien, 1040, Wien, Austria
| | - Jan M Tomczak
- Institut für Festkörperphysik, Technische Universität Wien, 1040, Wien, Austria
- King's College London, London, WC2R 2LS, UK
| | - Liang Si
- School of Physics, Northwest University, Xi'an, 710127, China
| | - Karsten Held
- Institut für Festkörperphysik, Technische Universität Wien, 1040, Wien, Austria
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16
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Xu M, Zhao Y, Chen Y, Ding X, Leng H, Hu Z, Wu X, Yi J, Yu X, Breese MBH, Xi S, Li M, Qiao L. Robust Superconductivity in Infinite-Layer Nickelates. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2305252. [PMID: 38685606 DOI: 10.1002/advs.202305252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 02/20/2024] [Indexed: 05/02/2024]
Abstract
The recent discovery of nickelate superconductivity represents an important step toward understanding the four-decade mastery of unconventional high-temperature superconductivity. However, the synthesis of the infinite-layer nickelate superconductors shows great challenges. Particularly, surface capping layers are usually unitized to facilitate the sample synthesis. This leads to an important question whether nickelate superconductors with d9 configuration and ultralow valence of Ni1+ are in metastable state and whether nickelate superconductivity can be robust? In this work, a series of redox cycling experiments are performed across the phase transition between perovskite Nd0.8Sr0.2NiO3 and infinite-layer Nd0.8Sr0.2NiO2. The infinite-layer Nd0.8Sr0.2NiO2 is quite robust in the redox environment and can survive the cycling experiments with unchanged crystallographic quality. However, as the cycling number goes on, the perovskite Nd0.8Sr0.2NiO3 shows structural degradation, suggesting stability of nickelate superconductivity is not restricted by the ultralow valence of Ni1+, but by the quality of its perovskite precursor. The observed robustness of infinite-layer Nd0.8Sr0.2NiO2 up to ten redox cycles further indicates that if an ideal high-quality perovskite precursor can be obtained, infinite-layer nickelate superconductivity can be very stable and sustainable under environmental conditions. This work provides important implications for potential device applications for nickelate superconductors.
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Affiliation(s)
- Minghui Xu
- School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Yan Zhao
- School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Yu Chen
- School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Xiang Ding
- School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Huaqian Leng
- School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Zheng Hu
- Center for Microscopy and Analysis, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, China
| | - Xiaoqiang Wu
- Institute for Advanced Study, Chengdu University, Chengdu, 610106, China
| | - Jiabao Yi
- Global Innovative Centre for Advanced Nanomaterials, School of Engineering, The University of Newcastle, Callaghan, NSW, 2308, Australia
| | - Xiaojiang Yu
- Singapore Synchrotron Light Source, National University of Singapore, Singapore, 117603, Singapore
| | - Mark B H Breese
- Singapore Synchrotron Light Source, National University of Singapore, Singapore, 117603, Singapore
| | - Shibo Xi
- Singapore Synchrotron Light Source, National University of Singapore, Singapore, 117603, Singapore
| | - Mengsha Li
- Center for Microscopy and Analysis, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, China
| | - Liang Qiao
- School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China
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17
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Che Q, van den Bosch ICG, Le PTP, Lazemi M, van der Minne E, Birkhölzer YA, Nunnenkamp M, Peerlings MLJ, Safonova OV, Nachtegaal M, Koster G, Baeumer C, de Jongh P, de Groot FMF. In Situ X-ray Absorption Spectroscopy of LaFeO 3 and LaFeO 3/LaNiO 3 Thin Films in the Electrocatalytic Oxygen Evolution Reaction. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2024; 128:5515-5523. [PMID: 38595773 PMCID: PMC11000219 DOI: 10.1021/acs.jpcc.3c07864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 02/23/2024] [Accepted: 02/26/2024] [Indexed: 04/11/2024]
Abstract
We study the electrocatalytic oxygen evolution reaction using in situ X-ray absorption spectroscopy (XAS) to track the dynamics of the valence state and the covalence of the metal ions of LaFeO3 and LaFeO3/LaNiO3 thin films. The active materials are 8 unit cells grown epitaxially on 100 nm conductive La0.67Sr0.33MnO3 layers using pulsed laser deposition (PLD). The perovskite layers are supported on monolayer Ca2Nb3O10 nanosheet-buffered 100 nm SiNx membranes. The in situ Fe and Ni K-edges XAS spectra were measured from the backside of the SiNx membrane using fluorescence yield detection under electrocatalytic reaction conditions. The XAS spectra show significant spectral changes, which indicate that (1) the metal (co)valencies increase, and (2) the number of 3d electrons remains constant with applied potential. We find that the whole 8 unit cells react to the potential changes, including the buried LaNiO3 film.
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Affiliation(s)
- Qijun Che
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands
| | | | - Phu T. P. Le
- MESA+
Institute for Nanotechnology, University
of Twente, Enschede 7500 AE, The Netherlands
| | - Masoud Lazemi
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands
| | - Emma van der Minne
- MESA+
Institute for Nanotechnology, University
of Twente, Enschede 7500 AE, The Netherlands
| | - Yorick A. Birkhölzer
- MESA+
Institute for Nanotechnology, University
of Twente, Enschede 7500 AE, The Netherlands
| | - Moritz Nunnenkamp
- MESA+
Institute for Nanotechnology, University
of Twente, Enschede 7500 AE, The Netherlands
| | - Matt L. J. Peerlings
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands
| | | | | | - Gertjan Koster
- MESA+
Institute for Nanotechnology, University
of Twente, Enschede 7500 AE, The Netherlands
| | - Christoph Baeumer
- MESA+
Institute for Nanotechnology, University
of Twente, Enschede 7500 AE, The Netherlands
| | - Petra de Jongh
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands
| | - Frank M. F. de Groot
- Materials
Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, Utrecht 3584 CG, The Netherlands
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18
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Parzyck CT, Gupta NK, Wu Y, Anil V, Bhatt L, Bouliane M, Gong R, Gregory BZ, Luo A, Sutarto R, He F, Chuang YD, Zhou T, Herranz G, Kourkoutis LF, Singer A, Schlom DG, Hawthorn DG, Shen KM. Absence of 3a 0 charge density wave order in the infinite-layer nickelate NdNiO 2. NATURE MATERIALS 2024; 23:486-491. [PMID: 38278983 PMCID: PMC10990928 DOI: 10.1038/s41563-024-01797-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 01/03/2024] [Indexed: 01/28/2024]
Abstract
A hallmark of many unconventional superconductors is the presence of many-body interactions that give rise to broken-symmetry states intertwined with superconductivity. Recent resonant soft X-ray scattering experiments report commensurate 3a0 charge density wave order in infinite-layer nickelates, which has important implications regarding the universal interplay between charge order and superconductivity in both cuprates and nickelates. Here we present X-ray scattering and spectroscopy measurements on a series of NdNiO2+x samples, which reveal that the signatures of charge density wave order are absent in fully reduced, single-phase NdNiO2. The 3a0 superlattice peak instead originates from a partially reduced impurity phase where excess apical oxygens form ordered rows with three-unit-cell periodicity. The absence of any observable charge density wave order in NdNiO2 highlights a crucial difference between the phase diagrams of cuprate and nickelate superconductors.
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Grants
- DE-SC0019414 U.S. Department of Energy (DOE)
- DE-AC02-05CH11231 U.S. Department of Energy (DOE)
- DE-AC02-06CH11357 U.S. Department of Energy (DOE)
- FA9550-21-1-0168 United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research (AF Office of Scientific Research)
- DMR-2104427 National Science Foundation (NSF)
- NNCI-2025233 National Science Foundation (NSF)
- GBMF3850 Gordon and Betty Moore Foundation (Gordon E. and Betty I. Moore Foundation)
- GBMF9073 Gordon and Betty Moore Foundation (Gordon E. and Betty I. Moore Foundation)
- Part of the research described in this paper was performed at the Canadian Light Source, a national research facility of the University of Saskatchewan, which is supported by the Canada Foundation for Innovation (CFI), the Natural Sciences and Engineering Research Council (NSERC), the National Research Council (NRC), the Canadian Institutes of Health Research (CIHR), the Government of Saskatchewan, and the University of Saskatchewan.
- The microscopy work at Cornell was supported by the NSF PARADIM, with additional support from Cornell University, the Weill Institute, the Kavli Institute at Cornell, and the Packard Foundation.
- G.H. acknowledges support from Severo Ochoa FUNFUTURE (No. CEX2019-000917-S) of the Spanish Ministry of Science and Innovation and by the Generalitat de Catalunya (2021 SGR 00445).
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Affiliation(s)
- C T Parzyck
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
| | - N K Gupta
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - Y Wu
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
| | - V Anil
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
| | - L Bhatt
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
| | - M Bouliane
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - R Gong
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - B Z Gregory
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - A Luo
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - R Sutarto
- Canadian Light Source, Saskatoon, Saskatchewan, Canada
| | - F He
- Canadian Light Source, Saskatoon, Saskatchewan, Canada
| | - Y-D Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - T Zhou
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, USA
| | - G Herranz
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Bellaterra, Spain
| | - L F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - A Singer
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - D G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
- Leibniz-Institut für Kristallzüchtung, Berlin, Germany
| | - D G Hawthorn
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada
| | - K M Shen
- Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY, USA.
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Bellaterra, Spain.
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA.
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19
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Wang H, Chen L, Rutherford A, Zhou H, Xie W. Long-Range Structural Order in a Hidden Phase of Ruddlesden-Popper Bilayer Nickelate La 3Ni 2O 7. Inorg Chem 2024; 63:5020-5026. [PMID: 38440856 PMCID: PMC10951943 DOI: 10.1021/acs.inorgchem.3c04474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 02/23/2024] [Accepted: 02/23/2024] [Indexed: 03/06/2024]
Abstract
The recent discovery of superconductivity in the Ruddlesden-Popper bilayer nickelate, specifically La3Ni2O7, has generated significant interest in the exploration of high-temperature superconductivity within this material family. In this study, we present the crystallographic and electrical resistivity properties of two distinct Ruddlesden-Popper nickelates: the bilayer La3Ni2O7 (referred to as 2222-phase) and a previously uncharacterized phase, La3Ni2O7 (1313-phase). The 2222-phase is characterized by a pseudo F-centered orthorhombic lattice, featuring bilayer perovskite [LaNiO3] layers interspaced by rock salt [LaO] layers, forming a repeated ...2222... sequence. Intriguingly, the 1313-phase, which displays semiconducting properties, crystallizes in the Cmmm space group and exhibits a pronounced predilection for a C-centered orthorhombic lattice. Within this structure, the perovskite [LaNiO3] layers exhibit a distinctive long-range ordered arrangement, alternating between single- and trilayer configurations, resulting in a ...1313... sequence. This report contributes to novel insights into the crystallography and the structure-property relationship of Ruddlesden-Popper nickelates, paving the way for further investigations into their unique physical properties.
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Affiliation(s)
- Haozhe Wang
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Long Chen
- Department
of Physics and Astronomy, University of
Tennessee, Knoxville, Tennessee 37996, United States
| | - Aya Rutherford
- Department
of Physics and Astronomy, University of
Tennessee, Knoxville, Tennessee 37996, United States
| | - Haidong Zhou
- Department
of Physics and Astronomy, University of
Tennessee, Knoxville, Tennessee 37996, United States
| | - Weiwei Xie
- Department
of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
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20
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Yang C, Pons R, Sigle W, Wang H, Benckiser E, Logvenov G, Keimer B, van Aken PA. Direct observation of strong surface reconstruction in partially reduced nickelate films. Nat Commun 2024; 15:378. [PMID: 38191551 PMCID: PMC10774438 DOI: 10.1038/s41467-023-44616-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 12/22/2023] [Indexed: 01/10/2024] Open
Abstract
The polarity of a surface can affect the electronic and structural properties of oxide thin films through electrostatic effects. Understanding the mechanism behind these effects requires knowledge of the atomic structure and electrostatic characteristics at the surface. In this study, we use annular bright-field imaging to investigate the surface structure of a Pr0.8Sr0.2NiO2+x (0 < x < 1) film. We observe a polar distortion coupled with octahedral rotations in a fully oxidized Pr0.8Sr0.2NiO3 sample, and a stronger polar distortion in a partially reduced sample. Its spatial depth extent is about three unit cells from the surface. Additionally, we use four-dimensional scanning transmission electron microscopy (4D-STEM) to directly image the local atomic electric field surrounding Ni atoms near the surface and discover distinct valence variations of Ni atoms, which are confirmed by atomic-resolution electron energy-loss spectroscopy (EELS). Our results suggest that the strong surface reconstruction in the reduced sample is closely related to the formation of oxygen vacancies from topochemical reduction. These findings provide insights into the understanding and evolution of surface polarity at the atomic level.
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Affiliation(s)
- Chao Yang
- Max Planck Institute for Solid State Research, Stuttgart, Germany.
| | - Rebecca Pons
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Wilfried Sigle
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Hongguang Wang
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Eva Benckiser
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Gennady Logvenov
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Bernhard Keimer
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Peter A van Aken
- Max Planck Institute for Solid State Research, Stuttgart, Germany
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21
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Liu YB, Mei JW, Ye F, Chen WQ, Yang F. s^{±}-Wave Pairing and the Destructive Role of Apical-Oxygen Deficiencies in La_{3}Ni_{2}O_{7} under Pressure. PHYSICAL REVIEW LETTERS 2023; 131:236002. [PMID: 38134785 DOI: 10.1103/physrevlett.131.236002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 10/20/2023] [Accepted: 11/02/2023] [Indexed: 12/24/2023]
Abstract
Recently, the bilayer perovskite nickelate La_{3}Ni_{2}O_{7} has been reported to show evidence of high-temperature superconductivity (SC) under a moderate pressure of about 14 GPa. To investigate the superconducting mechanism, pairing symmetry, and the role of apical-oxygen deficiencies in this material, we perform a random-phase approximation based study on a bilayer model consisting of the d_{x^{2}-y^{2}} and d_{3z^{2}-r^{2}} orbitals of Ni atoms in both the pristine crystal and the crystal with apical-oxygen deficiencies. Our analysis reveals an s^{±}-wave pairing symmetry driven by spin fluctuations. The crucial role of pressure lies in that it induces the emergence of the γ pocket, which is involved in the strongest Fermi-surface nesting. We further found the emergence of local moments in the vicinity of apical-oxygen deficiencies, which significantly suppresses the T_{c}. Therefore, it is possible to significantly enhance the T_{c} by eliminating oxygen deficiencies during the synthesis of the samples.
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Affiliation(s)
- Yu-Bo Liu
- School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Jia-Wei Mei
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
| | - Fei Ye
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
| | - Wei-Qiang Chen
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
| | - Fan Yang
- School of Physics, Beijing Institute of Technology, Beijing 100081, China
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22
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Shao TN, Zhang ZT, Qiao YJ, Zhao Q, Liu HW, Chen XX, Jiang WM, Yao CL, Chen XY, Chen MH, Dou RF, Xiong CM, Zhang GM, Yang YF, Nie JC. Kondo scattering in underdoped Nd 1-xSr xNiO 2 infinite-layer superconducting thin films. Natl Sci Rev 2023; 10:nwad112. [PMID: 37818115 PMCID: PMC10561711 DOI: 10.1093/nsr/nwad112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 12/25/2022] [Accepted: 03/13/2023] [Indexed: 10/12/2023] Open
Abstract
The recent discovery of superconductivity in infinite-layer nickelates generates tremendous research endeavors, but the ground state of their parent compounds is still under debate. Here, we report experimental evidence for the dominant role of Kondo scattering in the underdoped Nd1-xSrxNiO2 thin films. A resistivity minimum associated with logarithmic temperature dependence in both longitudinal and Hall resistivities are observed in the underdoped Nd1-xSrxNiO2 samples before the superconducting transition. At lower temperatures down to 0.04 K, the resistivities become saturated, following the prediction of the Kondo model. A linear scaling behavior [Formula: see text] between anomalous Hall conductivity [Formula: see text] and conductivity [Formula: see text]is revealed, verifying the dominant Kondo scattering at low temperature. The effect of weak (anti-)localization is found to be secondary. Our experiments can help in clarifying the basic physics in the underdoped Nd1-xSrxNiO2 infinite-layer thin films.
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Affiliation(s)
- Ting-Na Shao
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Zi-Tao Zhang
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Yu-Jie Qiao
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Qiang Zhao
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Hai-Wen Liu
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Xin-Xiang Chen
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Wei-Min Jiang
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Chun-Li Yao
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Xing-Yu Chen
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Mei-Hui Chen
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Rui-Fen Dou
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Chang-Min Xiong
- Department of Physics, Beijing Normal University, Beijing100875, China
| | - Guang-Ming Zhang
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing100084, China
- Frontier Science Center for Quantum Information, Beijing100084, China
| | - Yi-Feng Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing100190, China
- Songshan Lake Materials Laboratory, Dongguan523808, China
| | - Jia-Cai Nie
- Department of Physics, Beijing Normal University, Beijing100875, China
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23
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Zhang Q, Wan G, Starchenko V, Hu G, Dufresne EM, Zhou H, Jeen H, Almazan IC, Dong Y, Liu H, Sandy AR, Sterbinsky GE, Lee HN, Ganesh P, Fong DD. Intermittent Defect Fluctuations in Oxide Heterostructures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2305383. [PMID: 37578079 DOI: 10.1002/adma.202305383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 07/31/2023] [Indexed: 08/15/2023]
Abstract
The heterogeneous nature, local presence, and dynamic evolution of defects typically govern the ionic and electronic properties of a wide variety of functional materials. While the last 50 years have seen considerable efforts into development of new methods to identify the nature of defects in complex materials, such as the perovskite oxides, very little is known about defect dynamics and their influence on the functionality of a material. Here, the discovery of the intermittent behavior of point defects (oxygen vacancies) in oxide heterostructures employing X-ray photon correlation spectroscopy is reported. Local fluctuations between two ordered phases in strained SrCoOx with different degrees of stability of the oxygen vacancies are observed. Ab-initio-informed phase-field modeling reveals that fluctuations between the competing ordered phases are modulated by the oxygen ion/vacancy interaction energy and epitaxial strain. The results demonstrate how defect dynamics, evidenced by measurement and modeling of their temporal fluctuations, give rise to stochastic properties that now can be fully characterized using coherent X-rays, coupled for the first time to multiscale modeling in functional complex oxide heterostructures. The study and its findings open new avenues for engineering the dynamical response of functional materials used in neuromorphic and electrochemical applications.
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Affiliation(s)
- Qingteng Zhang
- X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Gang Wan
- Material Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Vitalii Starchenko
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Guoxiang Hu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Eric M Dufresne
- X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Hua Zhou
- X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Hyoungjeen Jeen
- Department of Physics, Pusan National University, Busan, 46241, South Korea
| | - Irene Calvo Almazan
- Material Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Yongqi Dong
- X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Huajun Liu
- Material Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Alec R Sandy
- X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | | | - Ho Nyung Lee
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - P Ganesh
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Dillon D Fong
- Material Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
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24
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Yang Z, Jin KJ, Gan Y, Ma C, Zhong Z, Yuan Y, Ge C, Guo EJ, Wang C, Xu X, He M, Zhang D, Yang G. Photoinduced Phase Transition in Infinite-Layer Nickelates. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2304146. [PMID: 37356048 DOI: 10.1002/smll.202304146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/15/2023] [Indexed: 06/27/2023]
Abstract
The quantum phase transition caused by regulating the electronic correlation in strongly correlated quantum materials has been a research hotspot in condensed matter science. Herein, a photon-induced quantum phase transition from the Kondo-Mott insulating state to the low temperature metallic one accompanying with the magnetoresistance changing from negative to positive in the infinite-layer NdNiO2 films is reported, where the antiferromagnetic coupling among the Ni1+ localized spins and the Kondo effect are effectively suppressed by manipulating the correlation of Ni-3d and Nd-5d electrons under the photoirradiation. Moreover, the critical temperature Tc of the superconducting-like transition exhibits a dome-shaped evolution with the maximum up to ≈42 K, and the electrons dominate the transport process proved by the Hall effect measurements. These findings not only make the photoinduction a promising way to control the quantum phase transition by manipulating the electronic correlation in Mott-like insulators, but also shed some light on the possibility of the superconducting in electron-doped nickelates.
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Affiliation(s)
- Zhen Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Kui-Juan Jin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Science, Beijing, 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
| | - Yulin Gan
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Cheng Ma
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Zhicheng Zhong
- Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo, 315201, China
| | - Ye Yuan
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Chen Ge
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Er-Jia Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Science, Beijing, 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
| | - Can Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Science, Beijing, 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
| | - Xiulai Xu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, 100871, China
| | - Meng He
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Dongxiang Zhang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Science, Beijing, 100049, China
| | - Guozhen Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Science, Beijing, 100049, China
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25
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Yin H, Wang S, Jin K. Enhanced Rashba Spin Orbit Coupling and Magnetic Behavior at Oxide Heterointerfaces by Optical Gating. J Phys Chem Lett 2023; 14:8684-8690. [PMID: 37733252 DOI: 10.1021/acs.jpclett.3c01811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
Complex oxide heterointerfaces have been a hot research spot due to their rich physical phenomena and broad quantum coherence that respond to multiple external stimuli. Among these external stimuli, light is a very powerful one to manipulate properties such as carrier density and spin characteristics. However, achieving a light-magnetic correlation is in high demand for multifield responding devices, and its intrinsic mechanism remains unclear. Here, by illuminating Nd0.86Sr0.14Al0.86Ni0.14O3-SrTiO3 heterointerfaces using 360 nm light, we observe a series of interesting physical phenomena, like enhanced magnetoresistance (MR). More interestingly, a band splitting and strong Rashba spin-orbit coupling (SOC) effect occur after illumination, accompanied by a magnetic feature and thus leading to an anomalous Hall effect (AHE). Upon optical gating, the magnetism can be caused by Rashba SOC induced spin-orbit torque (SOT). The work will be sure to have great importance in both theoretical studies and all-oxide devices.
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Affiliation(s)
- Hang Yin
- Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
| | - Shuanhu Wang
- Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
| | - Kexin Jin
- Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
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26
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Chen H, Yang YF, Zhang GM, Liu H. An electronic origin of charge order in infinite-layer nickelates. Nat Commun 2023; 14:5477. [PMID: 37673936 PMCID: PMC10482875 DOI: 10.1038/s41467-023-41236-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 08/23/2023] [Indexed: 09/08/2023] Open
Abstract
A charge order (CO) with a wavevector [Formula: see text] is observed in infinite-layer nickelates. Here we use first-principles calculations to demonstrate a charge-transfer-driven CO mechanism in infinite-layer nickelates, which leads to a characteristic Ni1+-Ni2+-Ni1+ stripe state. For every three Ni atoms, due to the presence of near-Fermi-level conduction bands, Hubbard interaction on Ni-d orbitals transfers electrons on one Ni atom to conduction bands and leaves electrons on the other two Ni atoms to become more localized. We further derive a low-energy effective model to elucidate that the CO state arises from a delicate competition between Hubbard interaction on Ni-d orbitals and charge transfer energy between Ni-d orbitals and conduction bands. With physically reasonable parameters, [Formula: see text] CO state is more stable than uniform paramagnetic state and usual checkerboard antiferromagnetic state. Our work highlights the multi-band nature of infinite-layer nickelates, which leads to some distinctive correlated properties that are not found in cuprates.
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Affiliation(s)
- Hanghui Chen
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai, 200122, China.
- Department of Physics, New York University, New York, NY, 10012, USA.
| | - Yi-Feng Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
- University of Chinese Academy of Sciences, Beijing, 100190, China.
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China.
| | - Guang-Ming Zhang
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China.
- Frontier Science Center for Quantum Information, Beijing, 100084, China.
| | - Hongquan Liu
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai, 200122, China
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27
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Sun W, Li Y, Liu R, Yang J, Li J, Wei W, Jin G, Yan S, Sun H, Guo W, Gu Z, Zhu Z, Sun Y, Shi Z, Deng Y, Wang X, Nie Y. Evidence for Anisotropic Superconductivity Beyond Pauli Limit in Infinite-Layer Lanthanum Nickelates. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2303400. [PMID: 37235743 DOI: 10.1002/adma.202303400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 05/14/2023] [Indexed: 05/28/2023]
Abstract
After being expected to be a promising analog to cuprates for decades, superconductivity has recently been discovered in infinite-layer nickelates, providing new opportunities to explore mechanisms of high-temperature superconductivity. However, in sharp contrast to the single-band and anisotropic superconductivity in cuprates, nickelates exhibit a multi-band electronic structure and an unexpected isotropic superconductivity as reported recently, which challenges the cuprate-like picture in nickelates. Here, it is shown that strong anisotropic magnetotransport behaviors exist in La-based nickelate films with enhanced crystallinity and superconductivity (T c onset $T_{\rm{c}}^{{\rm{onset}}}$ = 18.8 K,T c zero $T_{\rm{c}}^{{\rm{zero}}}$ = 16.5 K). The upper critical fields are anisotropic and violate the estimated Bardeen-Cooper-Schrieffer (BCS) Pauli limit (H Pauli , μ = 1 μ B = 1.86 × T c , H = 0 ${H}_{\mathrm{Pauli},\mu =1{\mu}_{B}}=1.86\ensuremath{\times{}}{T}_{\mathrm{c},H=0}$ ) for in-plane magnetic fields. Moreover, the anisotropic superconductivity is further manifested by the cusp-like peak of the angle-dependent Tc and the vortex motion anisotropy under external magnetic fields.
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Affiliation(s)
- Wenjie Sun
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Yueying Li
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Ruxin Liu
- Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Jiangfeng Yang
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Jiayi Li
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Wei Wei
- Department of Physics, Southeast University, Nanjing, 211189, P. R. China
| | - Gangjian Jin
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Shengjun Yan
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Haoying Sun
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Wei Guo
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Zhengbin Gu
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Zengwei Zhu
- Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China
| | - Yue Sun
- Department of Physics, Southeast University, Nanjing, 211189, P. R. China
| | - Zhixiang Shi
- Department of Physics, Southeast University, Nanjing, 211189, P. R. China
| | - Yu Deng
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Xuefeng Wang
- Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
| | - Yuefeng Nie
- National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China
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Wei W, Vu D, Zhang Z, Walker FJ, Ahn CH. Superconducting Nd 1-xEu xNiO 2 thin films using in situ synthesis. SCIENCE ADVANCES 2023; 9:eadh3327. [PMID: 37406111 DOI: 10.1126/sciadv.adh3327] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 05/31/2023] [Indexed: 07/07/2023]
Abstract
We report on superconductivity in Nd1-xEuxNiO2 using Eu as a 4f dopant of the parent NdNiO2 infinite-layer compound. We use an all-in situ molecular beam epitaxy reduction process to achieve the superconducting phase, providing an alternate method to the ex situ CaH2 reduction process to induce superconductivity in the infinite-layer nickelates. The Nd1-xEuxNiO2 samples exhibit a step-terrace structure on their surfaces, have a Tc onset of 21 K at x = 0.25, and have a large upper critical field that may be related to Eu 4f doping.
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Affiliation(s)
- Wenzheng Wei
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA
| | - Dung Vu
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA
| | - Zhan Zhang
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Frederick J Walker
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA
| | - Charles H Ahn
- Department of Applied Physics, Yale University, New Haven, CT 06520, USA
- Department of Physics, Yale University, New Haven, CT 06520, USA
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06520, USA
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29
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Lee K, Wang BY, Osada M, Goodge BH, Wang TC, Lee Y, Harvey S, Kim WJ, Yu Y, Murthy C, Raghu S, Kourkoutis LF, Hwang HY. Linear-in-temperature resistivity for optimally superconducting (Nd,Sr)NiO 2. Nature 2023; 619:288-292. [PMID: 37438595 DOI: 10.1038/s41586-023-06129-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 04/25/2023] [Indexed: 07/14/2023]
Abstract
The occurrence of superconductivity in proximity to various strongly correlated phases of matter has drawn extensive focus on their normal state properties, to develop an understanding of the state from which superconductivity emerges1-4. The recent finding of superconductivity in layered nickelates raises similar interests5-8. However, transport measurements of doped infinite-layer nickelate thin films have been hampered by materials limitations of these metastable compounds: in particular, a high density of extended defects9-11. Here, by moving to a substrate (LaAlO3)0.3(Sr2TaAlO6)0.7 that better stabilizes the growth and reduction conditions, we can synthesize the doping series of Nd1-xSrxNiO2 essentially free from extended defects. In their absence, the normal state resistivity shows a low-temperature upturn in the underdoped regime, linear behaviour near optimal doping and quadratic temperature dependence for overdoping. This is phenomenologically similar to the copper oxides2,12 despite key distinctions-namely, the absence of an insulating parent compound5,6,9,10, multiband electronic structure13,14 and a Mott-Hubbard orbital alignment rather than the charge-transfer insulator of the copper oxides15,16. We further observe an enhancement of superconductivity, both in terms of transition temperature and range of doping. These results indicate a convergence in the electronic properties of both superconducting families as the scale of disorder in the nickelates is reduced.
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Affiliation(s)
- Kyuho Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.
- Department of Physics, Stanford University, Stanford, CA, USA.
| | - Bai Yang Wang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Physics, Stanford University, Stanford, CA, USA
| | - Motoki Osada
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA
| | - Berit H Goodge
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - Tiffany C Wang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Applied Physics, Stanford University, Stanford, CA, USA
| | - Yonghun Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Applied Physics, Stanford University, Stanford, CA, USA
| | - Shannon Harvey
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Applied Physics, Stanford University, Stanford, CA, USA
| | - Woo Jin Kim
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Applied Physics, Stanford University, Stanford, CA, USA
| | - Yijun Yu
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Applied Physics, Stanford University, Stanford, CA, USA
| | | | - Srinivas Raghu
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Physics, Stanford University, Stanford, CA, USA
| | - Lena F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - Harold Y Hwang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Applied Physics, Stanford University, Stanford, CA, USA
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30
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Zhang G, Zulkharnay R, Ke X, Liao M, Liu L, Guo Y, Li Y, Rubahn HG, Moshchalkov VV, May PW. Unconventional Giant "Magnetoresistance" in Bosonic Semiconducting Diamond Nanorings. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2211129. [PMID: 36800532 DOI: 10.1002/adma.202211129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/12/2023] [Indexed: 06/02/2023]
Abstract
The emergence of superconductivity in doped insulators such as cuprates and pnictides coincides with their doping-driven insulator-metal transitions. Above the critical doping threshold, a metallic state sets in at high temperatures, while superconductivity sets in at low temperatures. An unanswered question is whether the formation of Cooper pairsin a well-established metal will inevitably transform the host material into a superconductor, as manifested by a resistance drop. Here, this question is addressed by investigating the electrical transport in nanoscale rings (full loops) and half loops manufactured from heavily boron-doped diamond. It is shown that in contrast to the diamond half-loops (DHLs) exhibiting a metal-superconductor transition, the diamond nanorings (DNRs) demonstrate a sharp resistance increase up to 430% and a giant negative "magnetoresistance" below the superconducting transition temperature of the starting material. The finding of the unconventional giant negative "magnetoresistance", as distinct from existing categories of magnetoresistance, that is, the conventional giant magnetoresistance in magnetic multilayers, the colossal magnetoresistance in perovskites, and the geometric magnetoresistance in semiconductor-metal hybrids, reveals the transformation of the DNRs from metals to bosonic semiconductors upon the formation of Cooper pairs. DNRs like these could be used to manipulate Cooper pairs in superconducting quantum devices.
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Affiliation(s)
- Gufei Zhang
- Danish Institute for Advanced Study and Mads Clausen Institute, University of Southern Denmark, Alsion 2, Sonderborg, DK-6400, Denmark
| | - Ramiz Zulkharnay
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK
| | - Xiaoxing Ke
- Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China
| | - Meiyong Liao
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan
| | - Liwang Liu
- Laboratory for Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Heverlee, B-3001, Belgium
| | - Yujie Guo
- Photonics Research Group, Department of Information Technology, Ghent University-IMEC, Ghent, 9052, Belgium
| | - Yejun Li
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics & Electronics and School of Materials Science & Engineering, Central South University, Changsha, 410083, China
| | - Horst-Günter Rubahn
- Danish Institute for Advanced Study and Mads Clausen Institute, University of Southern Denmark, Alsion 2, Sonderborg, DK-6400, Denmark
| | | | - Paul W May
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK
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31
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Guo Y, Qiu D, Shao M, Song J, Wang Y, Xu M, Yang C, Li P, Liu H, Xiong J. Modulations in Superconductors: Probes of Underlying Physics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2209457. [PMID: 36504310 DOI: 10.1002/adma.202209457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/16/2022] [Indexed: 06/02/2023]
Abstract
The importance of modulations is elevated to an unprecedented level, due to the delicate conditions required to bring out exotic phenomena in quantum materials, such as topological materials, magnetic materials, and superconductors. Recently, state-of-the-art modulation techniques in material science, such as electric-double-layer transistor, piezoelectric-based strain apparatus, angle twisting, and nanofabrication, have been utilized in superconductors. They not only efficiently increase the tuning capability to the broader ranges but also extend the tuning dimensionality to unprecedented degrees of freedom, including quantum fluctuations of competing phases, electronic correlation, and phase coherence essential to global superconductivity. Here, for a comprehensive review, these techniques together with the established modulation methods, such as elemental substitution, annealing, and polarization-induced gating, are contextualized. Depending on the mechanism of each method, the modulations are categorized into stoichiometric manipulation, electrostatic gating, mechanical modulation, and geometrical design. Their recent advances are highlighted by applications in newly discovered superconductors, e.g., nickelates, Kagome metals, and magic-angle graphene. Overall, the review is to provide systematic modulations in emergent superconductors and serve as the coordinate for future investigations, which can stimulate researchers in superconductivity and other fields to perform various modulations toward a thorough understanding of quantum materials.
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Affiliation(s)
- Yehao Guo
- State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Dong Qiu
- State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Mingxin Shao
- State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Jingyan Song
- State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Yang Wang
- State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Minyi Xu
- State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Chao Yang
- State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Peng Li
- State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Haiwen Liu
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Jie Xiong
- State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China
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32
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Wang BY, Wang TC, Hsu YT, Osada M, Lee K, Jia C, Duffy C, Li D, Fowlie J, Beasley MR, Devereaux TP, Fisher IR, Hussey NE, Hwang HY. Effects of rare-earth magnetism on the superconducting upper critical field in infinite-layer nickelates. SCIENCE ADVANCES 2023; 9:eadf6655. [PMID: 37196089 DOI: 10.1126/sciadv.adf6655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Accepted: 04/14/2023] [Indexed: 05/19/2023]
Abstract
The search for superconductivity in infinite-layer nickelates was motivated by analogy to the cuprates, and this perspective has framed much of the initial consideration of this material. However, a growing number of studies have highlighted the involvement of rare-earth orbitals; in that context, the consequences of varying the rare-earth element in the superconducting nickelates have been much debated. Here, we show notable differences in the magnitude and anisotropy of the superconducting upper critical field across the La-, Pr-, and Nd-nickelates. These distinctions originate from the 4f electron characteristics of the rare-earth ions in the lattice: They are absent for La3+, nonmagnetic for the Pr3+ singlet ground state, and magnetic for the Nd3+ Kramer's doublet. The unique polar and azimuthal angle-dependent magnetoresistance found in the Nd-nickelates can be understood to arise from the magnetic contribution of the Nd3+ 4f moments. Such robust and tunable superconductivity suggests potential in future high-field applications.
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Affiliation(s)
- Bai Yang Wang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
- Department of Physics, Stanford University, Stanford, CA 94305, USA
| | - Tiffany C Wang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
- Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
| | - Yu-Te Hsu
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525 ED Nijmegen, Netherlands
| | - Motoki Osada
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Kyuho Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
- Department of Physics, Stanford University, Stanford, CA 94305, USA
| | - Chunjing Jia
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Caitlin Duffy
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525 ED Nijmegen, Netherlands
| | - Danfeng Li
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Jennifer Fowlie
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
- Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
| | - Malcolm R Beasley
- Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
| | - Thomas P Devereaux
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Ian R Fisher
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
- Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
| | - Nigel E Hussey
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525 ED Nijmegen, Netherlands
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
| | - Harold Y Hwang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
- Department of Applied Physics, Stanford University, Stanford, CA 94305, USA
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33
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Yang C, Ortiz RA, Wang Y, Sigle W, Wang H, Benckiser E, Keimer B, van Aken PA. Thickness-Dependent Interface Polarity in Infinite-Layer Nickelate Superlattices. NANO LETTERS 2023; 23:3291-3297. [PMID: 37027232 PMCID: PMC10141440 DOI: 10.1021/acs.nanolett.3c00192] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 04/04/2023] [Indexed: 06/19/2023]
Abstract
The interface polarity plays a vital role in the physical properties of oxide heterointerfaces because it can cause specific modifications of the electronic and atomic structure. Reconstruction due to the strong polarity of the NdNiO2/SrTiO3 interface in recently discovered superconducting nickelate films may play an important role, as no superconductivity has been observed in the bulk. By employing four-dimensional scanning transmission electron microscopy and electron energy-loss spectroscopy, we studied effects of oxygen distribution, polyhedral distortion, elemental intermixing, and dimensionality in NdNiO2/SrTiO3 superlattices grown on SrTiO3 (001) substrates. Oxygen distribution maps show a gradual variation of the oxygen content in the nickelate layer. Remarkably, we demonstrate thickness-dependent interface reconstruction due to a polar discontinuity. An average cation displacement of ∼0.025 nm at interfaces in 8NdNiO2/4SrTiO3 superlattices is twice larger than that in 4NdNiO2/2SrTiO3 superlattices. Our results provide insights into the understanding of reconstructions at NdNiO2/SrTiO3 polar interfaces.
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Affiliation(s)
- Chao Yang
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Roberto A. Ortiz
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Yi Wang
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
- Center
for Microscopy and Analysis, Nanjing University
of Aeronautics and Astronautics, Nanjing 210016, P. R.
China
| | - Wilfried Sigle
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Hongguang Wang
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Eva Benckiser
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Bernhard Keimer
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Peter A. van Aken
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
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34
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Kitatani M, Si L, Worm P, Tomczak JM, Arita R, Held K. Optimizing Superconductivity: From Cuprates via Nickelates to Palladates. PHYSICAL REVIEW LETTERS 2023; 130:166002. [PMID: 37154662 DOI: 10.1103/physrevlett.130.166002] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 02/28/2023] [Indexed: 05/10/2023]
Abstract
Motivated by cuprate and nickelate superconductors, we perform a comprehensive study of the superconducting instability in the single-band Hubbard model. We calculate the spectrum and superconducting transition temperature T_{c} as a function of filling and Coulomb interaction for a range of hopping parameters, using the dynamical vertex approximation. We find the sweet spot for high T_{c} to be at intermediate coupling, moderate Fermi surface warping, and low hole doping. Combining these results with first principles calculations, neither nickelates nor cuprates are close to this optimum within the single-band description. Instead, we identify some palladates, notably RbSr_{2}PdO_{3} and A_{2}^{'}PdO_{2}Cl_{2} (A^{'}=Ba_{0.5}La_{0.5}), to be virtually optimal, while others, such as NdPdO_{2}, are too weakly correlated.
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Affiliation(s)
- Motoharu Kitatani
- Department of Material Science, University of Hyogo, Ako, Hyogo 678-1297, Japan
- RIKEN Center for Emergent Matter Sciences (CEMS), Wako, Saitama 351-0198, Japan
| | - Liang Si
- School of Physics, Northwest University, Xi'an 710127, China
- Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
| | - Paul Worm
- Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
| | - Jan M Tomczak
- Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
- Department of Physics, King's College London, Strand, London WC2R 2LS, United Kingdom
| | - Ryotaro Arita
- RIKEN Center for Emergent Matter Sciences (CEMS), Wako, Saitama 351-0198, Japan
- Research Center for Advanced Science and Technology, University of Tokyo 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan
| | - Karsten Held
- Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
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35
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Goodge BH, Geisler B, Lee K, Osada M, Wang BY, Li D, Hwang HY, Pentcheva R, Kourkoutis LF. Resolving the polar interface of infinite-layer nickelate thin films. NATURE MATERIALS 2023; 22:466-473. [PMID: 36973543 DOI: 10.1038/s41563-023-01510-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 02/14/2023] [Indexed: 06/18/2023]
Abstract
Nickel-based superconductors provide a long-awaited experimental platform to explore possible cuprate-like superconductivity. Despite similar crystal structure and d electron filling, however, superconductivity in nickelates has thus far only been stabilized in thin-film geometry, raising questions about the polar interface between substrate and thin film. Here we conduct a detailed experimental and theoretical study of the prototypical interface between Nd1-xSrxNiO2 and SrTiO3. Atomic-resolution electron energy loss spectroscopy in the scanning transmission electron microscope reveals the formation of a single intermediate Nd(Ti,Ni)O3 layer. Density functional theory calculations with a Hubbard U term show how the observed structure alleviates the polar discontinuity. We explore the effects of oxygen occupancy, hole doping and cation structure to disentangle the contributions of each for reducing interface charge density. Resolving the non-trivial interface structure will be instructive for future synthesis of nickelate films on other substrates and in vertical heterostructures.
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Affiliation(s)
- Berit H Goodge
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA.
| | - Benjamin Geisler
- Department of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, Germany
| | - Kyuho Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Physics, Stanford University, Stanford, CA, USA
| | - Motoki Osada
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA
| | - Bai Yang Wang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Physics, Stanford University, Stanford, CA, USA
| | - Danfeng Li
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, USA
- Department of Physics, City University of Hong Kong, Kowloon, Hong Kong
| | - Harold Y Hwang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Applied Physics, Stanford University, Stanford, CA, USA
| | - Rossitza Pentcheva
- Department of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, Germany
| | - Lena F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA.
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36
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Ferenc Segedin D, Goodge BH, Pan GA, Song Q, LaBollita H, Jung MC, El-Sherif H, Doyle S, Turkiewicz A, Taylor NK, Mason JA, N'Diaye AT, Paik H, El Baggari I, Botana AS, Kourkoutis LF, Brooks CM, Mundy JA. Limits to the strain engineering of layered square-planar nickelate thin films. Nat Commun 2023; 14:1468. [PMID: 36928184 PMCID: PMC10020545 DOI: 10.1038/s41467-023-37117-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 03/02/2023] [Indexed: 03/18/2023] Open
Abstract
The layered square-planar nickelates, Ndn+1NinO2n+2, are an appealing system to tune the electronic properties of square-planar nickelates via dimensionality; indeed, superconductivity was recently observed in Nd6Ni5O12 thin films. Here, we investigate the role of epitaxial strain in the competing requirements for the synthesis of the n = 3 Ruddlesden-Popper compound, Nd4Ni3O10, and subsequent reduction to the square-planar phase, Nd4Ni3O8. We synthesize our highest quality Nd4Ni3O10 films under compressive strain on LaAlO3 (001), while Nd4Ni3O10 on NdGaO3 (110) exhibits tensile strain-induced rock salt faults but retains bulk-like transport properties. A high density of extended defects forms in Nd4Ni3O10 on SrTiO3 (001). Films reduced on LaAlO3 become insulating and form compressive strain-induced c-axis canting defects, while Nd4Ni3O8 films on NdGaO3 are metallic. This work provides a pathway to the synthesis of Ndn+1NinO2n+2 thin films and sets limits on the ability to strain engineer these compounds via epitaxy.
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Affiliation(s)
| | - Berit H Goodge
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - Grace A Pan
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Qi Song
- Department of Physics, Harvard University, Cambridge, MA, USA
| | | | - Myung-Chul Jung
- Department of Physics, Arizona State University, Tempe, AZ, USA
| | | | - Spencer Doyle
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Ari Turkiewicz
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Nicole K Taylor
- School of Engineering and Applied Science, Harvard University, Cambridge, MA, USA
| | - Jarad A Mason
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
| | - Alpha T N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Hanjong Paik
- Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM), Cornell University, Ithaca, NY, USA
- School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK, USA
| | | | - Antia S Botana
- Department of Physics, Arizona State University, Tempe, AZ, USA
| | - Lena F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | | | - Julia A Mundy
- Department of Physics, Harvard University, Cambridge, MA, USA.
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37
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Kim WJ, Smeaton MA, Jia C, Goodge BH, Cho BG, Lee K, Osada M, Jost D, Ievlev AV, Moritz B, Kourkoutis LF, Devereaux TP, Hwang HY. Geometric frustration of Jahn-Teller order in the infinite-layer lattice. Nature 2023; 615:237-243. [PMID: 36813969 DOI: 10.1038/s41586-022-05681-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 12/22/2022] [Indexed: 02/24/2023]
Abstract
The Jahn-Teller effect, in which electronic configurations with energetically degenerate orbitals induce lattice distortions to lift this degeneracy, has a key role in many symmetry-lowering crystal deformations1. Lattices of Jahn-Teller ions can induce a cooperative distortion, as exemplified by LaMnO3 (refs. 2,3). Although many examples occur in octahedrally4 or tetrahedrally5 coordinated transition metal oxides due to their high orbital degeneracy, this effect has yet to be manifested for square-planar anion coordination, as found in infinite-layer copper6,7, nickel8,9, iron10,11 and manganese oxides12. Here we synthesize single-crystal CaCoO2 thin films by topotactic reduction of the brownmillerite CaCoO2.5 phase. We observe a markedly distorted infinite-layer structure, with ångström-scale displacements of the cations from their high-symmetry positions. This can be understood to originate from the Jahn-Teller degeneracy of the dxz and dyz orbitals in the d7 electronic configuration along with substantial ligand-transition metal mixing. A complex pattern of distortions arises in a [Formula: see text] tetragonal supercell, reflecting the competition between an ordered Jahn-Teller effect on the CoO2 sublattice and the geometric frustration of the associated displacements of the Ca sublattice, which are strongly coupled in the absence of apical oxygen. As a result of this competition, the CaCoO2 structure forms an extended two-in-two-out type of Co distortion following 'ice rules'13.
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Affiliation(s)
- Woo Jin Kim
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA. .,Department of Applied Physics, Stanford University, Stanford, CA, USA.
| | - Michelle A Smeaton
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
| | - Chunjing Jia
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Department of Physics, University of Florida, Gainesville, FL, USA
| | - Berit H Goodge
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.,Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - Byeong-Gwan Cho
- Pohang Accelerator Laboratory, POSTECH, Pohang, Republic of Korea
| | - Kyuho Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Department of Physics, Stanford University, Stanford, CA, USA
| | - Motoki Osada
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA
| | - Daniel Jost
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - Anton V Ievlev
- Center for Nanophase Materials Sciences Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Brian Moritz
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - Lena F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.,Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - Thomas P Devereaux
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA
| | - Harold Y Hwang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA. .,Department of Applied Physics, Stanford University, Stanford, CA, USA.
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38
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Li H, Hao P, Zhang J, Gordon K, Linn AG, Chen X, Zheng H, Zhou X, Mitchell JF, Dessau DS. Electronic structure and correlations in planar trilayer nickelate Pr 4Ni 3O 8. SCIENCE ADVANCES 2023; 9:eade4418. [PMID: 36638179 PMCID: PMC9839319 DOI: 10.1126/sciadv.ade4418] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
The discovery of superconductivity in planar nickelates raises the question of how the electronic structure and correlations of Ni1+ compounds compare to those of the Cu2+ cuprate superconductors. Here, we present an angle-resolved photoemission spectroscopy (ARPES) study of the trilayer nickelate Pr4Ni3O8, revealing a Fermi surface resembling that of the hole-doped cuprates but with critical differences. Specifically, the main portions of the Fermi surface are extremely similar to that of the bilayer cuprates, with an additional piece that can accommodate additional hole doping. We find that the electronic correlations are about twice as strong in the nickelates and are almost k-independent, indicating that they originate from a local effect, likely the Mott interaction, whereas cuprate interactions are somewhat less local. Nevertheless, the nickelates still demonstrate the strange-metal behavior in the electron scattering rates. Understanding the similarities and differences between these two families of strongly correlated superconductors is an important challenge.
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Affiliation(s)
- Haoxiang Li
- Department of Physics, University of Colorado Boulder, Boulder, CO 80309, USA
- Advanced Materials Thrust, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou, Guangdong 511453, China
| | - Peipei Hao
- Department of Physics, University of Colorado Boulder, Boulder, CO 80309, USA
| | - Junjie Zhang
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
- Institute of Crystal Materials and State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, China
| | - Kyle Gordon
- Department of Physics, University of Colorado Boulder, Boulder, CO 80309, USA
| | - A. Garrison Linn
- Department of Physics, University of Colorado Boulder, Boulder, CO 80309, USA
| | - Xinglong Chen
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Hong Zheng
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Xiaoqing Zhou
- Department of Physics, University of Colorado Boulder, Boulder, CO 80309, USA
| | - J. F. Mitchell
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - D. S. Dessau
- Department of Physics, University of Colorado Boulder, Boulder, CO 80309, USA
- Center for Experiments on Quantum Materials, University of Colorado Boulder, Boulder, CO 80309, USA
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39
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Wang Q, Gu Y, Chen C, Qiao L, Pan F, Song C. Realizing Metastable Cobaltite Perovskite via Proton-Induced Filling of Oxygen Vacancy Channels. ACS APPLIED MATERIALS & INTERFACES 2023; 15:1574-1582. [PMID: 36537655 DOI: 10.1021/acsami.2c18311] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The interaction between transition-metal oxides (TMOs) and protons has become a key issue in magneto-ionics and proton-conducting fuel cells. Until now, most investigations on oxide-proton reactions rely on electrochemical tools, while the direct interplay between protons and oxides remains basically at simple dissolution of metal oxides by an acidic solution. In this work, we find classical TMO brownmillerite SrCoO2.5 (B-SCO) films with ordered oxygen vacancy channels experiencing an interesting transition to a metastable perovskite phase (M-SCO) in a weak acidic solution. M-SCO exhibits a strong ferromagnetism (1.01 μB/Co, Tc > 200 K) and a greatly elevated electrical conductivity (∼104 of pristine SrCoO2.5), which is similar to the prototypical perovskite SrCoO3. Besides, such M-SCO tends to transform back to B-SCO in a vacuum environment or heating at a relatively low temperature. Two possible mechanisms (H2O addition/active oxygen filling) have been proposed to explain the phenomenon, and the control experiments demonstrate that the latter mechanism is the dominant process. Our work finds a new way to realize cobaltite perovskite with enhanced magnetoelectric properties and may deepen the understanding of oxide-proton interaction in an aqueous solution.
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Affiliation(s)
- Qian Wang
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing100084, China
| | - Youdi Gu
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing100084, China
| | - Chong Chen
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing100084, China
| | - Leilei Qiao
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing100084, China
| | - Feng Pan
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing100084, China
| | - Cheng Song
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing100084, China
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40
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Jung MC, LaBollita H, Pardo V, Botana AS. Antiferromagnetic insulating state in layered nickelates at half filling. Sci Rep 2022; 12:17864. [PMID: 36284152 PMCID: PMC9596485 DOI: 10.1038/s41598-022-22176-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 10/11/2022] [Indexed: 11/18/2022] Open
Abstract
We provide a set of computational experiments based on ab initio calculations to elucidate whether a cuprate-like antiferromagnetic insulating state can be present in the phase diagram of the low-valence layered nickelate family (R[Formula: see text]Ni[Formula: see text]O[Formula: see text], R= rare-earth, [Formula: see text]) in proximity to half-filling. It is well established that at [Formula: see text] filling the infinite-layer ([Formula: see text]) nickelate is metallic, in contrast to cuprates wherein an antiferromagnetic insulator is expected. We show that for the Ruddlesden-Popper (RP) reduced phases of the series (finite n) an antiferromagnetic insulating ground state can naturally be obtained instead at [Formula: see text] filling, due to the spacer RO[Formula: see text] fluorite slabs present in their structure that block the c-axis dispersion. In the [Formula: see text] nickelate, the same type of solution can be derived if the off-plane R-Ni coupling is suppressed. We show how this can be achieved if a structural element that cuts off the c-axis dispersion is introduced (i.e. vacuum in a monolayer of RNiO[Formula: see text], or a blocking layer in multilayers formed by (RNiO[Formula: see text])[Formula: see text]/(RNaO[Formula: see text])[Formula: see text]).
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Affiliation(s)
- Myung-Chul Jung
- Department of Physics, Arizona State University, Tempe, AZ, 85287, USA
| | | | - Victor Pardo
- Instituto de Materiais iMATUS, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain.
- Departamento de Física Aplicada, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain.
| | - Antia S Botana
- Department of Physics, Arizona State University, Tempe, AZ, 85287, USA.
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41
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Tam CC, Choi J, Ding X, Agrestini S, Nag A, Wu M, Huang B, Luo H, Gao P, García-Fernández M, Qiao L, Zhou KJ. Charge density waves in infinite-layer NdNiO 2 nickelates. NATURE MATERIALS 2022; 21:1116-1120. [PMID: 35982306 DOI: 10.1038/s41563-022-01330-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 07/07/2022] [Indexed: 06/15/2023]
Abstract
In materials science, much effort has been devoted to the reproduction of superconductivity in chemical compositions, analogous to cuprate superconductors since their discovery over 30 years ago. This approach was recently successful in realising superconductivity in infinite-layer nickelates1-6. Although differing from cuprates in electronic and magnetic properties, strong Coulomb interactions suggest that infinite-layer nickelates have a propensity towards various symmetry-breaking orders that populate cuprates7-10. Here we report the observation of charge density waves (CDWs) in infinite-layer NdNiO2 films using Ni L3 resonant X-ray scattering. Remarkably, CDWs form in Nd 5d and Ni 3d orbitals at the same commensurate wavevector (0.333, 0) reciprocal lattice units, with non-negligible out-of-plane dependence and an in-plane correlation length of up to ~60 Å. Spectroscopic studies reveal a strong connection between CDWs and Nd 5d-Ni 3d orbital hybridization. Upon entering the superconducting state at 20% Sr doping, the CDWs disappear. Our work demonstrates the existence of CDWs in infinite-layer nickelates with a multiorbital character distinct from cuprates, which establishes their low-energy physics.
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Affiliation(s)
- Charles C Tam
- Diamond Light Source, Didcot, United Kingdom
- H. H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
| | - Jaewon Choi
- Diamond Light Source, Didcot, United Kingdom
| | - Xiang Ding
- School of Physics, University of Electronic Science and Technology of China, Chengdu, China
| | | | - Abhishek Nag
- Diamond Light Source, Didcot, United Kingdom
- Laboratory for Non-linear Optics, Paul Scherrer Institut, Villigen, PSI, Switzerland
| | - Mei Wu
- International Center for Quantum Materials and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, China
| | - Bing Huang
- Beijing Computational Science Research Center, Beijing, China
| | - Huiqian Luo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, China
| | - Peng Gao
- International Center for Quantum Materials and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, China
| | | | - Liang Qiao
- School of Physics, University of Electronic Science and Technology of China, Chengdu, China.
| | - Ke-Jin Zhou
- Diamond Light Source, Didcot, United Kingdom.
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42
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Pressure-induced monotonic enhancement of T c to over 30 K in superconducting Pr 0.82Sr 0.18NiO 2 thin films. Nat Commun 2022; 13:4367. [PMID: 35902566 PMCID: PMC9334608 DOI: 10.1038/s41467-022-32065-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 07/14/2022] [Indexed: 11/09/2022] Open
Abstract
The successful synthesis of superconducting infinite-layer nickelate thin films with the highest Tc ≈ 15 K has ignited great enthusiasm for this material class as potential analogs of the high-Tc cuprates. Pursuing a higher Tc is always an imperative task in studying a new superconducting material system. Here we report high-quality Pr0.82Sr0.18NiO2 thin films with Tconset ≈ 17 K synthesized by carefully tuning the amount of CaH2 in the topotactic chemical reduction and the effect of pressure on its superconducting properties by measuring electrical resistivity under various pressures in a cubic anvil cell apparatus. We find that the onset temperature of the superconductivity, Tconset, can be enhanced monotonically from ~17 K at ambient pressure to ~31 K at 12.1 GPa without showing signatures of saturation upon increasing pressure. This encouraging result indicates that the Tc of infinite-layer nickelates superconductors still has room to go higher and it can be further boosted by applying higher pressures or strain engineering in the heterostructure films.
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43
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Krieger G, Martinelli L, Zeng S, Chow LE, Kummer K, Arpaia R, Moretti Sala M, Brookes NB, Ariando A, Viart N, Salluzzo M, Ghiringhelli G, Preziosi D. Charge and Spin Order Dichotomy in NdNiO_{2} Driven by the Capping Layer. PHYSICAL REVIEW LETTERS 2022; 129:027002. [PMID: 35867432 DOI: 10.1103/physrevlett.129.027002] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 06/03/2022] [Indexed: 06/15/2023]
Abstract
Superconductivity in infinite-layer nickelates holds exciting analogies with that of cuprates, with similar structures and 3d-electron count. Using resonant inelastic x-ray scattering, we studied electronic and magnetic excitations and charge density correlations in Nd_{1-x}Sr_{x}NiO_{2} thin films with and without an SrTiO_{3} capping layer. We observe dispersing magnons only in the capped samples, progressively dampened at higher doping. We detect an elastic resonant scattering peak in the uncapped x=0 compound at wave vector (∼⅓,0), remindful of the charge order signal in hole doped cuprates. The peak weakens at x=0.05 and disappears in the superconducting x=0.20 film. The role of the capping on the electronic reconstruction far from the interface remains to be understood.
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Affiliation(s)
- G Krieger
- Université de Strasbourg, CNRS, IPCMS UMR 7504, F-67034 Strasbourg, France
| | - L Martinelli
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - S Zeng
- Department of Physics, Faculty of Science, National University of Singapore, 117551 Singapore, Singapore
| | - L E Chow
- Department of Physics, Faculty of Science, National University of Singapore, 117551 Singapore, Singapore
| | - K Kummer
- ESRF, The European Synchrotron, 71 Avenue des Martyrs, F-38043 Grenoble, France
| | - R Arpaia
- Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - M Moretti Sala
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - N B Brookes
- ESRF, The European Synchrotron, 71 Avenue des Martyrs, F-38043 Grenoble, France
| | - A Ariando
- Department of Physics, Faculty of Science, National University of Singapore, 117551 Singapore, Singapore
| | - N Viart
- Université de Strasbourg, CNRS, IPCMS UMR 7504, F-67034 Strasbourg, France
| | - M Salluzzo
- CNR-SPIN Complesso di Monte S. Angelo, via Cinthia-I-80126 Napoli, Italy
| | - G Ghiringhelli
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
- CNR-SPIN, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - D Preziosi
- Université de Strasbourg, CNRS, IPCMS UMR 7504, F-67034 Strasbourg, France
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44
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Abstract
Superconductivity has entered the nickel age marked by enormous experimental and theoretical efforts. Notwithstanding, synthesizing nickelate superconductors remains extremely challenging, not least due to incomplete oxygen reduction and topotactic hydrogen. Here, we present density-functional theory calculations for nickelate superconductors with additional topotactic hydrogen or oxygen, namely La1−xSrxNiO2Hδ and LaNiO2+δ. We identify a phonon mode as a possible indication for topotactic hydrogen and discuss the charge redistribution patterns around oxygen and hydrogen impurities.
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45
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Yan F, Mi Z, Chen J, Hu H, Gao L, Wang J, Chen N, Jiang Y, Qiao L, Chen J. Revealing the role of interfacial heterogeneous nucleation in the metastable thin film growth of rare-earth nickelate electronic transition materials. Phys Chem Chem Phys 2022; 24:9333-9344. [PMID: 35383792 DOI: 10.1039/d1cp05347g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Although rare-earth nickelates (ReNiO3, Re ≠ La) exhibit abundant electronic phases and widely adjustable metal to insulator electronic transition properties, their practical electronic applications are largely impeded by their intrinsic meta-stability. Apart from elevating the oxygen reaction pressure, heterogeneous nucleation is expected to be an alternative strategy that enables the crystallization of ReNiO3 at low meta-stability. In this work, the respective roles of high oxygen pressure and heterogeneous interface in triggering ReNiO3 thin film growth in the metastable state are revealed. ReNiO3 (Re = Nd, Sm, Eu, Gd and Dy) thin films grown on a LaAlO3 single crystal substrate show effective crystallization at atmospheric pressure without the necessity to apply high oxygen pressure, suggesting that the interfacial bonding between the ReNiO3 and substrates can sufficiently reduce the positive Gibbs formation energy of ReNiO3, which is further verified by the first-principles calculations. Nevertheless, the abrupt electronic transitions only appear in ReNiO3 thin films grown at high oxygen pressure, in which case the oxygen vacancies are effectively eliminated via high oxygen pressure reactions as indicated by near-edge X-ray absorption fine structure (NEXAFS) analysis. This work unveils the synergistic effects of heterogeneous nucleation and high oxygen pressure on the growth of high quality ReNiO3 thin films.
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Affiliation(s)
- Fengbo Yan
- Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
| | - Zhishan Mi
- Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China. .,Material Digital R&D Center, China Iron & Steel Research Institute Group, Beijing, 100081, China
| | - Jinhao Chen
- Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
| | - Haiyang Hu
- Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
| | - Lei Gao
- Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China. .,Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
| | - Jiaou Wang
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
| | - Nuofu Chen
- School of Renewable Energy, North China Electric Power University, Beijing 102206, China
| | - Yong Jiang
- Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
| | - Lijie Qiao
- Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China. .,Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
| | - Jikun Chen
- Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
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46
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Li Y, Wrobel F, Cheng Y, Yan X, Cao H, Zhang Z, Bhattacharya A, Sun J, Hong H, Wang H, Liu Y, Zhou H, Fong DD. Self-healing Growth of LaNiO 3 on a Mixed-Terminated Perovskite Surface. ACS APPLIED MATERIALS & INTERFACES 2022; 14:16928-16938. [PMID: 35353496 DOI: 10.1021/acsami.2c02357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Developing atomic-scale synthesis control is a prerequisite for understanding and engineering the exotic physics inherent to transition-metal oxide heterostructures. Thus, far, however, the number of materials systems explored has been extremely limited, particularly with regard to the crystalline substrate, which is routinely SrTiO3. Here, we investigate the growth of a rare-earth nickelate─LaNiO3─on (LaAlO3)(Sr2AlTaO6) (LSAT) (001) by oxide molecular beam epitaxy (MBE). Whereas the LSAT substrates are smooth, they do not exhibit the single surface termination usually assumed necessary for control over the interface structure. Performing both nonresonant and resonant anomalous in situ synchrotron surface X-ray scattering during MBE growth, we show that reproducible heterostructures can be achieved regardless of both the mixed surface termination and the layer-by-layer deposition sequence. The rearrangement of the layers occurs dynamically during growth, resulting in the fabrication of high-quality LaNiO3/LSAT heterostructures with a sharp and consistent interfacial structure. This is due to the thermodynamics of the deposition window as well as the nature of the chemical species at interfaces─here, the flexible charge state of nickel at the oxide surface. This has important implications regarding the use of a wider variety of substrates for fundamental studies on complex oxide synthesis.
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Affiliation(s)
- Yan Li
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Friederike Wrobel
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Yingjie Cheng
- College of Physics, Jilin University, Changchun 130012, China
| | - Xi Yan
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Hui Cao
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Zhongying Zhang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Anand Bhattacharya
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Jirong Sun
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Hawoong Hong
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Huanhua Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuzi Liu
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Hua Zhou
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Dillon D Fong
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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47
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Nomura Y, Arita R. Superconductivity in infinite-layer nickelates. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2022; 85:052501. [PMID: 35240593 DOI: 10.1088/1361-6633/ac5a60] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 03/03/2022] [Indexed: 06/14/2023]
Abstract
The recent discovery of the superconductivity in the doped infinite layer nickelatesRNiO2(R= La, Pr, Nd) is of great interest since the nickelates are isostructural to doped (Ca, Sr)CuO2having superconducting transition temperature (Tc) of about 110 K. Verifying the commonalities and differences between these oxides will certainly give a new insight into the mechanism of highTcsuperconductivity in correlated electron systems. In this paper, we review experimental and theoretical works on this new superconductor and discuss the future perspectives for the 'nickel age' of superconductivity.
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Affiliation(s)
- Yusuke Nomura
- RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Ryotaro Arita
- RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Applied Physics, University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan
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48
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Sahinovic A, Geisler B. Quantifying transfer learning synergies in infinite-layer and perovskite nitrides, oxides, and fluorides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:214003. [PMID: 35234671 DOI: 10.1088/1361-648x/ac5995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 03/01/2022] [Indexed: 06/14/2023]
Abstract
We combine density functional theory simulations and active learning (AL) of element-embedding neural networks (NNs) to explore the sample efficiency for the prediction of vacancy layer formation energies and lattice parameters inABXninfinite-layer (n= 2) versus perovskite (n= 3) nitrides, oxides, and fluorides in the spirit of transfer learning. Following a comprehensive data analysis from different thermodynamic, structural, and statistical perspectives, we show that NNs model these observables with high precision, using merely∼30%of the data for training and exclusively theA-,B-, andX-site element names as minimal input devoid of any physicala prioriinformation. Element embedding autonomously arranges the chemical elements with a characteristic recurrent topology, such that their relations are consistent with human knowledge. We compare two different embedding strategies and show that these techniques render additional input such as atomic properties negligible. Simultaneously, we demonstrate that AL is largely independent of the initial training set, and exemplify its superiority over randomly composed training sets. Despite their highly distinct chemistry, the present approach successfully identifies fundamental quantum-mechanical universalities between nitrides, oxides, and fluorides that enhance the combined prediction accuracy by up to 16% with respect to three specialized NNs at equivalent numerical effort. This quantification of synergistic effects provides an impression of the transfer learning improvements one may expect for similarly complex materials. Finally, by embedding the tensor product of theBandXsites and subsequent quantitative cluster analysis, we establish from an unbiased artificial-intelligence perspective that oxides and nitrides exhibit significant parallels, whereas fluorides constitute a rather distinct materials class.
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Affiliation(s)
- Armin Sahinovic
- Department of Physics, Universität Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
| | - Benjamin Geisler
- Department of Physics, Universität Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
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49
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Zeng S, Li C, Chow LE, Cao Y, Zhang Z, Tang CS, Yin X, Lim ZS, Hu J, Yang P, Ariando A. Superconductivity in infinite-layer nickelate La 1-xCa xNiO 2 thin films. SCIENCE ADVANCES 2022; 8:eabl9927. [PMID: 35179968 PMCID: PMC8856608 DOI: 10.1126/sciadv.abl9927] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 12/23/2021] [Indexed: 05/25/2023]
Abstract
We report the observation of superconductivity in infinite-layer Ca-doped LaNiO2 (La1-xCaxNiO2) thin films and construct their phase diagram. Unlike the metal-insulator transition in Nd- and Pr-based nickelates, the undoped and underdoped La1-xCaxNiO2 thin films are entirely insulating from 300 K down to 2 K. A superconducting dome is observed at 0.15 < x < 0.3 with weakly insulating behavior at the overdoped regime. Moreover, the sign of the Hall coefficient RH changes at low temperature for samples with a higher doping level. However, distinct from the Nd- and Pr-based nickelates, the RH-sign-change temperature remains at around 35 K as the doping increases, which begs further theoretical and experimental investigation to reveal the role of the 4f orbital to the (multi)band nature of the superconducting nickelates. Our results also emphasize a notable role of lattice correlation on the multiband structures of the infinite-layer nickelates.
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Affiliation(s)
- Shengwei Zeng
- Department of Physics, Faculty of Science, National University of Singapore, Singapore 117551, Singapore
| | - Changjian Li
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Lin Er Chow
- Department of Physics, Faculty of Science, National University of Singapore, Singapore 117551, Singapore
| | - Yu Cao
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore
| | - Zhaoting Zhang
- Department of Physics, Faculty of Science, National University of Singapore, Singapore 117551, Singapore
| | - Chi Sin Tang
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, Singapore 117603, Singapore
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Xinmao Yin
- Shanghai Key Laboratory of High Temperature Superconductors, Physics Department, Shanghai University, Shanghai 200444, China
| | - Zhi Shiuh Lim
- Department of Physics, Faculty of Science, National University of Singapore, Singapore 117551, Singapore
| | - Junxiong Hu
- Department of Physics, Faculty of Science, National University of Singapore, Singapore 117551, Singapore
| | - Ping Yang
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, Singapore 117603, Singapore
| | - Ariando Ariando
- Department of Physics, Faculty of Science, National University of Singapore, Singapore 117551, Singapore
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50
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Pan GA, Ferenc Segedin D, LaBollita H, Song Q, Nica EM, Goodge BH, Pierce AT, Doyle S, Novakov S, Córdova Carrizales D, N'Diaye AT, Shafer P, Paik H, Heron JT, Mason JA, Yacoby A, Kourkoutis LF, Erten O, Brooks CM, Botana AS, Mundy JA. Superconductivity in a quintuple-layer square-planar nickelate. NATURE MATERIALS 2022; 21:160-164. [PMID: 34811494 DOI: 10.1038/s41563-021-01142-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 09/23/2021] [Indexed: 06/13/2023]
Abstract
Since the discovery of high-temperature superconductivity in copper oxide materials1, there have been sustained efforts to both understand the origins of this phase and discover new cuprate-like superconducting materials2. One prime materials platform has been the rare-earth nickelates and, indeed, superconductivity was recently discovered in the doped compound Nd0.8Sr0.2NiO2 (ref. 3). Undoped NdNiO2 belongs to a series of layered square-planar nickelates with chemical formula Ndn+1NinO2n+2 and is known as the 'infinite-layer' (n = ∞) nickelate. Here we report the synthesis of the quintuple-layer (n = 5) member of this series, Nd6Ni5O12, in which optimal cuprate-like electron filling (d8.8) is achieved without chemical doping. We observe a superconducting transition beginning at ~13 K. Electronic structure calculations, in tandem with magnetoresistive and spectroscopic measurements, suggest that Nd6Ni5O12 interpolates between cuprate-like and infinite-layer nickelate-like behaviour. In engineering a distinct superconducting nickelate, we identify the square-planar nickelates as a new family of superconductors that can be tuned via both doping and dimensionality.
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Affiliation(s)
- Grace A Pan
- Department of Physics, Harvard University, Cambridge, MA, USA
| | | | | | - Qi Song
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Emilian M Nica
- Department of Physics, Arizona State University, Tempe, AZ, USA
| | - Berit H Goodge
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - Andrew T Pierce
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Spencer Doyle
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Steve Novakov
- Department of Physics, University of Michigan, Ann Arbor, MI, USA
| | | | - Alpha T N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Padraic Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Hanjong Paik
- Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM), Cornell University, Ithaca, NY, USA
| | - John T Heron
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Jarad A Mason
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
| | - Amir Yacoby
- Department of Physics, Harvard University, Cambridge, MA, USA
| | - Lena F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA
| | - Onur Erten
- Department of Physics, Arizona State University, Tempe, AZ, USA
| | | | - Antia S Botana
- Department of Physics, Arizona State University, Tempe, AZ, USA.
| | - Julia A Mundy
- Department of Physics, Harvard University, Cambridge, MA, USA.
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