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Asmara TC, Green RJ, Suter A, Wei Y, Zhang W, Knez D, Harris G, Tseng Y, Yu T, Betto D, Garcia-Fernandez M, Agrestini S, Klein YM, Kumar N, Galdino CW, Salman Z, Prokscha T, Medarde M, Müller E, Soh Y, Brookes NB, Zhou KJ, Radovic M, Schmitt T. Emergence of Interfacial Magnetism in Strongly-Correlated Nickelate-Titanate Superlattices. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2310668. [PMID: 39101291 DOI: 10.1002/adma.202310668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 06/21/2024] [Indexed: 08/06/2024]
Abstract
Strongly-correlated transition-metal oxides are widely known for their various exotic phenomena. This is exemplified by rare-earth nickelates such as LaNiO3, which possess intimate interconnections between their electronic, spin, and lattice degrees of freedom. Their properties can be further enhanced by pairing them in hybrid heterostructures, which can lead to hidden phases and emergent phenomena. An important example is the LaNiO3/LaTiO3 superlattice, where an interlayer electron transfer has been observed from LaTiO3 into LaNiO3 leading to a high-spin state. However, macroscopic emergence of magnetic order associated with this high-spin state has so far not been observed. Here, by using muon spin rotation, x-ray absorption, and resonant inelastic x-ray scattering, direct evidence of an emergent antiferromagnetic order with high magnon energy and exchange interactions at the LaNiO3/LaTiO3 interface is presented. As the magnetism is purely interfacial, a single LaNiO3/LaTiO3 interface can essentially behave as an atomically thin strongly-correlated quasi-2D antiferromagnet, potentially allowing its technological utilization in advanced spintronic devices. Furthermore, its strong quasi-2D magnetic correlations, orbitally-polarized planar ligand holes, and layered superlattice design make its electronic, magnetic, and lattice configurations resemble the precursor states of superconducting cuprates and nickelates, but with an S→1 spin state instead.
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Affiliation(s)
- Teguh Citra Asmara
- PSI Center for Photon Science, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
- European X-Ray Free-Electron Laser Facility GmbH, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Robert J Green
- Department of Physics & Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
- Stewart Blusson Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, BC, V6T 1Z4, Canada
| | - Andreas Suter
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Yuan Wei
- PSI Center for Photon Science, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Wenliang Zhang
- PSI Center for Photon Science, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Daniel Knez
- Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, Graz, 8010, Austria
| | - Grant Harris
- Department of Physics & Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
| | - Yi Tseng
- PSI Center for Photon Science, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Tianlun Yu
- PSI Center for Photon Science, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Davide Betto
- European Synchrotron Radiation Facility, 71, avenue des Martyrs, Cedex 9, Grenoble, F-38043, France
| | - Mirian Garcia-Fernandez
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
| | - Stefano Agrestini
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
| | - Yannick Maximilian Klein
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Neeraj Kumar
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Carlos William Galdino
- PSI Center for Photon Science, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Zaher Salman
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Thomas Prokscha
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Marisa Medarde
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Elisabeth Müller
- Electron Microscopy Facility, Paul Scherrer Institut, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Yona Soh
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Nicholas B Brookes
- European Synchrotron Radiation Facility, 71, avenue des Martyrs, Cedex 9, Grenoble, F-38043, France
| | - Ke-Jin Zhou
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
| | - Milan Radovic
- PSI Center for Photon Science, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
| | - Thorsten Schmitt
- PSI Center for Photon Science, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, CH-5232, Switzerland
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Zheng J, Shi W, Li Z, Zhang J, Yang CY, Zhu Z, Wang M, Zhang J, Han F, Zhang H, Chen Y, Hu F, Shen B, Chen Y, Sun J. Charge-Transfer-Induced Interfacial Ferromagnetism in Ferromagnet-Free Oxide Heterostructures. ACS NANO 2024; 18:9232-9241. [PMID: 38466082 DOI: 10.1021/acsnano.4c01910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Due to the strong interlayer coupling between multiple degrees of freedom, oxide heterostructures have demonstrated exotic properties that are not shown by their bulk counterparts. One of the most interesting properties is ferromagnetism at the interface formed between "nonferromagnetic" compounds. Here we report on the interfacial ferromagnetic phase induced in the superlattices consisting of the two paramagnetic oxides CaRuO3 (CRO) and LaNiO3 (LNO). By varying the sublayer thickness in the superlattice period, we demonstrate that the ferromagnetic order has been established in both CaRuO3 and LaNiO3 sublayers, exhibiting an identical Curie temperature of ∼75 K. The X-ray absorption spectra suggest a strong charge transfer from Ru to Ni at the interface, triggering superexchange interactions between Ru/Ni ions and giving rise to the emergent ferromagnetic phase. Moreover, the X-ray linear dichroism spectra reveal the preferential occupancy of the d3z2-r2 orbital for the Ru ions and the dx2-y2 orbital for the Ni ions in the heterostructure. This leads to different magnetic anisotropy of the superlattices when they are dominated by CRO or LNO sublayers. This work clearly demonstrates a charge-transfer-induced interfacial ferromagnetic phase in the whole ferromagnet-free oxide heterostructures, offering a feasible way to tailor oxide materials for desired functionalities.
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Affiliation(s)
- Jie Zheng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Wenxiao Shi
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Zhe Li
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Jing Zhang
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Chao-Yao Yang
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
| | - Zhaozhao Zhu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Mengqin Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Jine Zhang
- School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Furong Han
- School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Hui Zhang
- School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Yunzhong Chen
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Fengxia Hu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Baogen Shen
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, People's Republic of China
| | - Yuansha Chen
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Jirong Sun
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- Spintronics Institute, School of Physics and Technology, University of Jinan, Jinan 250022, China
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Li J, Zheng C, Zhao E, Mao J, Cheng Y, Liu H, Hu Z, Ling T. Ferromagnetic ordering correlated strong metal-oxygen hybridization for superior oxygen reduction reaction activity. Proc Natl Acad Sci U S A 2023; 120:e2307901120. [PMID: 37844253 PMCID: PMC10614601 DOI: 10.1073/pnas.2307901120] [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: 05/11/2023] [Accepted: 09/06/2023] [Indexed: 10/18/2023] Open
Abstract
The efficiency of transition-metal oxide materials toward oxygen-related electrochemical reactions is classically controlled by metal-oxygen hybridization. Recently, the unique magnetic exchange interactions in transition-metal oxides are proposed to facilitate charge transfer and reduce activation barrier in electrochemical reactions. Such spin/magnetism-related effects offer a new and rich playground to engineer oxide electrocatalysts, but their connection with the classical metal-oxygen hybridization theory remains an open question. Here, using the MnxVyOz family as a platform, we show that ferromagnetic (FM) ordering is intrinsically correlated with the strong manganese (Mn)-oxygen (O) hybridization of Mn oxides, thus significantly increasing the oxygen reduction reaction (ORR) activity. We demonstrate that this enhanced Mn-O hybridization in FM Mn oxides is closely associated with the generation of active Mn sites on the oxide surface and obtaining favorable reaction thermodynamics under operating conditions. As a result, FM-Mn2V2O7 with a high degree of Mn-O hybridization achieves a record high ORR activity. Our work highlights the potential applications of magnetic oxide materials with strong metal-oxygen hybridization in energy devices.
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Affiliation(s)
- Jisi Li
- School of Materials Science and Engineering, Tianjin University, Tianjin300072, China
| | - Caiyan Zheng
- School of Physics, Nankai University, Tianjin300071, China
| | - Erling Zhao
- School of Materials Science and Engineering, Tianjin University, Tianjin300072, China
| | - Jing Mao
- School of Materials Science and Engineering, Tianjin University, Tianjin300072, China
| | - Yahui Cheng
- Department of Electronics, Nankai University, Tianjin300350, China
| | - Hui Liu
- School of Materials Science and Engineering, Tianjin University, Tianjin300072, China
| | - Zhenpeng Hu
- School of Physics, Nankai University, Tianjin300071, China
| | - Tao Ling
- School of Materials Science and Engineering, Tianjin University, Tianjin300072, China
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4
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Thao NTT, Kim K, Ryu JH, An BS, Nayak AK, Jang JU, Na KH, Choi WY, Ali G, Chae KH, Akbar M, Chung KY, Cho HS, Park JH, Kim BH, Han H. Colossal Dielectric Perovskites of Calcium Copper Titanate (CaCu 3 Ti 4 O 12 ) with Low-Iridium Dopants Enables Ultrahigh Mass Activity for the Acidic Oxygen Evolution Reaction. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2207695. [PMID: 36991522 DOI: 10.1002/advs.202207695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 03/09/2023] [Indexed: 06/04/2023]
Abstract
Oxygen evolution reaction (OER) under acidic conditions becomes of significant importance for the practical use of a proton exchange membrane (PEM) water electrolyzer. In particular, maximizing the mass activity of iridium (Ir) is one of the maiden issues. Herein, the authors discover that the Ir-doped calcium copper titanate (CaCu₃Ti₄O₁₂, CCTO) perovskite exhibits ultrahigh mass activity up to 1000 A gIr -1 for the acidic OER, which is 66 times higher than that of the benchmark catalyst, IrO2 . By substituting Ti with Ir in CCTO, metal-oxygen (M-O) covalency can be significantly increased leading to the reduced energy barrier for charge transfer. Further, highly polarizable CCTO perovskite referred to as "colossal dielectric", possesses low defect formation energy for oxygen vacancy inducing a high number of oxygen vacancies in Ir-doped CCTO (Ir-CCTO). Electron transfer occurs from the oxygen vacancies and Ti to the substituted Ir consequentially resulting in the electron-rich Ir and -deficient Ti sites. Thus, favorable adsorptions of oxygen intermediates can take place at Ti sites while the Ir ensures efficient charge supplies during OER, taking a top position of the volcano plot. Simultaneously, the introduced Ir dopants form nanoclusters at the surface of Ir-CCTO, which can boost catalytic activity for the acidic OER.
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Affiliation(s)
- Nguyen Thi Thu Thao
- Department of Energy Engineering, Konkuk University, 05029, 120 Neungdong-ro, Seoul, Republic of Korea
| | - Kwangsoo Kim
- Computational Science & Engineering Laboratory, Korea Institute of Energy Research, 34129, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea
- Department of Chemical and Biomolecular Engineering, Yonsei University, 03722, 50 Yonsei-ro, Seoul, Republic of Korea
| | - Jeong Ho Ryu
- Department of Materials Science and Engineering, Korea National University of Transportation, 27469, 50 Daehak-ro, Chungju, Republic of Korea
| | - Byeong-Seon An
- Analysis Center for Energy Research, Korea Institute of Energy Research, 34129, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea
| | - Arpan Kumar Nayak
- Department of Energy Engineering, Konkuk University, 05029, 120 Neungdong-ro, Seoul, Republic of Korea
| | - Jin Uk Jang
- Department of Energy Engineering, Konkuk University, 05029, 120 Neungdong-ro, Seoul, Republic of Korea
| | - Kyeong-Han Na
- Department of Metal and Materials Engineering, Gangneung-Wonju National University, 25457, 7 Jukheongil, Gangneung, Gangwon, Republic of Korea
- Smart Hydrogen Energy Center, Gangneung-Wonju National University, 25457, 7 Jukheongil, Gangneung, Gangwon, Republic of Korea
| | - Won-Youl Choi
- Department of Metal and Materials Engineering, Gangneung-Wonju National University, 25457, 7 Jukheongil, Gangneung, Gangwon, Republic of Korea
- Smart Hydrogen Energy Center, Gangneung-Wonju National University, 25457, 7 Jukheongil, Gangneung, Gangwon, Republic of Korea
| | - Ghulam Ali
- U.S.-Pakistan Center for Advanced Studies in Energy (USPCASE), National University of Sciences and Technology (NUST), H-12, Islamabad, Pakistan
| | - Keun Hwa Chae
- Advanced Analysis Center, Korea Institute of Science and Technology, 02792, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, Republic of Korea
| | - Muhammad Akbar
- Energy Storage Research Center, Korea Institute of Science and Technology, 02792, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, Republic of Korea
- Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology, 02792, Seoul, Republic of Korea
| | - Kyung Yoon Chung
- Energy Storage Research Center, Korea Institute of Science and Technology, 02792, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, Republic of Korea
- Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology, 02792, Seoul, Republic of Korea
| | - Hyun-Seok Cho
- Hydrogen Research Department, Korea Institute of Energy Research, 34129, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea
| | - Jong Hyeok Park
- Computational Science & Engineering Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
| | - Byung-Hyun Kim
- Computational Science & Engineering Laboratory, Korea Institute of Energy Research, 34129, 152 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea
| | - HyukSu Han
- Department of Energy Engineering, Konkuk University, 05029, 120 Neungdong-ro, Seoul, Republic of Korea
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Wang C, Zhai P, Xia M, Liu W, Gao J, Sun L, Hou J. Identification of the Origin for Reconstructed Active Sites on Oxyhydroxide for Oxygen Evolution Reaction. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2209307. [PMID: 36408935 DOI: 10.1002/adma.202209307] [Citation(s) in RCA: 34] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/07/2022] [Indexed: 06/16/2023]
Abstract
The regulation of atomic and electronic structures of active sites plays an important role in the rational design of oxygen evolution reaction (OER) catalysts toward electrocatalytic hydrogen generation. However, the precise identification of the active sites for surface reconstruction behavior during OER remains elusive for water-alkali electrolysis. Herein, irreversible reconstruction behavior accompanied by copper dynamic evolution for cobalt iron layered double hydroxide (CoFe LDH) precatalyst to form CoFeCuOOH active species with high-valent Co species is reported, identifying the origin of reconstructed active sites through operando UV-Visible (UV-vis), in situ Raman, and X-ray absorption fine-structure (XAFS) spectroscopies. Density functional theory analysis rationalizes this typical electronic structure evolution causing the transfer of intramolecular electrons to form ligand holes, promoting the reconstruction of active sites. Specifically, unambiguous identification of active sites for CoFeCuOOH is explored by in situ 18 O isotope-labeling differential electrochemical mass spectrometry (DEMS) and supported by theoretical calculation, confirming mechanism switch to oxygen-vacancy-site mechanism (OVSM) pathway on lattice oxygen. This work enables to elucidate the vital role of dynamic active-site generation and the representative contribution of OVSM pathway for efficient OER performance.
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Affiliation(s)
- Chen Wang
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Panlong Zhai
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Mingyue Xia
- Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Wei Liu
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Junfeng Gao
- Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Licheng Sun
- Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry, School of Science, Westlake University, Hangzhou, 310024, P. R. China
- Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Stockholm, 10044, Sweden
| | - Jungang Hou
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
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6
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Wang ZA, Xue W, Yan F, Zhu W, Liu Y, Zhang X, Wei Z, Chang K, Yuan Z, Wang K. Selectively Controlled Ferromagnets by Electric Fields in van der Waals Ferromagnetic Heterojunctions. NANO LETTERS 2023; 23:710-717. [PMID: 36626837 DOI: 10.1021/acs.nanolett.2c04796] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Charge transfer plays a key role at the interfaces of heterostructures, which can affect electronic structures and ultimately the physical properties of the materials. However, charge transfer is difficult to manipulate externally once the interface is formed. The recently discovered van der Waals ferromagnets with atomically sharp interfaces provided a perfect platform for the electrical control of interfacial charge transfer. Here, we report magnetoresistance experiments revealing electrically tunable charge transfer in Fe3GeTe2/Cr2Ge2Te6/Fe3GeTe2 all-magnetic van der Waals heterostructures, which can be exploited to selectively modify the switching fields of the top or bottom Fe3GeTe2 electrodes. The directional charge transfer from metallic Fe3GeTe2 to semiconducting Cr2Ge2Te6 is revealed by first-principles calculations, which remarkably modifies the magnetic anisotropy energy of Fe3GeTe2, leading to the dramatically suppressed coercivity. The electrically selective control of magnetism demonstrated in this study could stimulate the development of spintronic devices based on van der Waals magnets.
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Affiliation(s)
- Zi-Ao Wang
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Weishan Xue
- Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Faguang Yan
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
| | - Wenkai Zhu
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
| | - Yi Liu
- Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Xinhui Zhang
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhongming Wei
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kai Chang
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhe Yuan
- Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Kaiyou Wang
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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7
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Lu X, Liu J, Zhang N, Xie B, Yang S, Liu W, Jiang Z, Huang Z, Yang Y, Miao J, Li W, Cho S, Liu Z, Liu Z, Shen D. Dimensionality-Controlled Evolution of Charge-Transfer Energy in Digital Nickelates Superlattices. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2105864. [PMID: 35603969 PMCID: PMC9313943 DOI: 10.1002/advs.202105864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 04/06/2022] [Indexed: 06/15/2023]
Abstract
Fundamental understanding and control of the electronic structure evolution in rare-earth nickelates is a fascinating and meaningful issue, as well as being helpful to understand the mechanism of recently discovered superconductivity. Here the dimensionality effect on the ground electronic state in high-quality (NdNiO3 ) m /(SrTiO3 )1 superlattices is systematically studied through transport and soft X-ray absorption spectroscopy. The metal-to-insulator transition temperature decreases with the thickness of the NdNiO3 slab decreasing from bulk to 7 unit cells, then increases gradually as m further reduces to 1 unit cell. Spectral evidence demonstrates that the stabilization of insulating phase can be attributed to the increase of the charge-transfer energy between O 2p and Ni 3d bands. The prominent multiplet feature on the Ni L3 edge develops with the decrease of NdNiO3 slab thickness, suggesting the strengthening of the charge disproportionate state under the dimensional confinement. This work provides convincing evidence that dimensionality is an effective knob to modulate the charge-transfer energy and thus the collective ground state in nickelates.
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Affiliation(s)
- Xiangle Lu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Jishan Liu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Nian Zhang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Binping Xie
- Feimion Instruments (Shanghai) Company LimitedShanghai201906China
| | - Shuai Yang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Wanling Liu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Zhicheng Jiang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Zhe Huang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Yichen Yang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Jin Miao
- State Key Laboratory of Surface PhysicsDepartment of PhysicsFudan UniversityShanghai200433China
| | - Wei Li
- State Key Laboratory of Surface PhysicsDepartment of PhysicsFudan UniversityShanghai200433China
| | - Soohyun Cho
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Zhengtai Liu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Zhonghao Liu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Dawei Shen
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
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8
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Niu X, Chen BB, Zhong N, Xiang PH, Duan CG. Topological Hall effect in SrRuO 3thin films and heterostructures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:244001. [PMID: 35325882 DOI: 10.1088/1361-648x/ac60d0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 03/24/2022] [Indexed: 06/14/2023]
Abstract
Transition metal oxides hold a wide spectrum of fascinating properties endowed by the strong electron correlations. In 4dand 5doxides, exotic phases can be realized with the involvement of strong spin-orbit coupling (SOC), such as unconventional magnetism and topological superconductivity. Recently, topological Hall effects (THEs) and magnetic skyrmions have been uncovered in SrRuO3thin films and heterostructures, where the presence of SOC and inversion symmetry breaking at the interface are believed to play a key role. Realization of magnetic skyrmions in oxides not only offers a platform to study topological physics with correlated electrons, but also opens up new possibilities for magnetic oxides using in the low-power spintronic devices. In this review, we discuss recent observations of THE and skyrmions in the SRO film interfaced with various materials, with a focus on the electric tuning of THE. We conclude with a discussion on the directions of future research in this field.
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Affiliation(s)
- Xu Niu
- Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai, 200241, People's Republic of China
| | - Bin-Bin Chen
- Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai, 200241, People's Republic of China
| | - Ni Zhong
- Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai, 200241, People's Republic of China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China
| | - Ping-Hua Xiang
- Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai, 200241, People's Republic of China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China
| | - Chun-Gang Duan
- Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai, 200241, People's Republic of China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China
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9
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Liu Y, Huang H, Xue L, Sun J, Wang X, Xiong P, Zhu J. Recent advances in the heteroatom doping of perovskite oxides for efficient electrocatalytic reactions. NANOSCALE 2021; 13:19840-19856. [PMID: 34849520 DOI: 10.1039/d1nr05797a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Perovskite-type transition metal oxides have emerged as promising electrocatalysts for various electrocatalytic reactions owing to their low cost, compositional tunability and high stability. However, insufficient electrocatalytic activities of pristine perovskite oxides hinder their pathway towards real-world applications. The incorporation of heteroatoms into perovskite oxide structures has been regarded as an efficient way to improve the electrocatalytic performance. This minireview summarizes the recent advances in the heteroatom doping of perovskite oxides as efficient electrocatalysts for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). These heteroatom doping strategies are classified based on various types of doping sites. The mechanisms of improved electrocatalytic activities are discussed in detail within different doping sites and various kinds of dopants. Finally, the remaining challenges and perspectives are outlined for future developments of perovskite oxide-based catalysts.
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Affiliation(s)
- Yifan Liu
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
| | - Honglan Huang
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
| | - Liang Xue
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
| | - Jingwen Sun
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
| | - Xin Wang
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
| | - Pan Xiong
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
| | - Junwu Zhu
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
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10
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Li X, Bai Y, Cheng Z. Revealing the Correlation of OER with Magnetism: A New Descriptor of Curie/Neel Temperature for Magnetic Electrocatalysts. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2101000. [PMID: 34227260 PMCID: PMC8425880 DOI: 10.1002/advs.202101000] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/30/2021] [Indexed: 05/31/2023]
Abstract
Developing accurate descriptors for oxygen evolution reaction (OER) is of great significance yet challenging, which roots in and also boosts the understanding of its intrinsic mechanisms. Despite various descriptors are reported, it still has limitations in the facile prediction, given that complicated analytical techniques as well as time-consuming modeling and calculations are indispensable. In the present work, strong correlation of magnetic property with OER performance is revealed by in-depth investigations on the crystal and electronic structures. A facile descriptor of Curie/Neel temperature (TC/N ) is developed for La2- x Srx Co2 O6- δ perovskite oxides, based on the inference that both magnetism and OER are rooted in the electron exchange interaction. Specifically, both the TC/N and OER activity are proportional to the degree of p-d orbital hybridization, which increases with enlarged bond angle of Co─O─Co and/or increased oxidation of Co. This finding reveals that TC/N from magnetic characterizations is an effective descriptor in designing novel OER electrocatalysts, and interdisciplinary researches are advantageous for revealing the controversial mechanisms of OER process.
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Affiliation(s)
- Xiaoning Li
- International Joint Research Laboratory of New Energy Materials and Devices of Henan ProvinceSchool of Physics and ElectronicsHenan UniversityKaifeng475004P. R. China
| | - Ying Bai
- International Joint Research Laboratory of New Energy Materials and Devices of Henan ProvinceSchool of Physics and ElectronicsHenan UniversityKaifeng475004P. R. China
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials (ISEM)University of WollongongWollongong2500Australia
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11
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Zhang N, Wang C, Chen J, Hu C, Ma J, Deng X, Qiu B, Cai L, Xiong Y, Chai Y. Metal Substitution Steering Electron Correlations in Pyrochlore Ruthenates for Efficient Acidic Water Oxidation. ACS NANO 2021; 15:8537-8548. [PMID: 33939408 DOI: 10.1021/acsnano.1c00266] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Exploring the advanced oxygen evolution reaction (OER) electrocatalysts is highly desirable toward sustainable energy conversion and storage, yet improved efficiency in acidic media is largely hindered by its sluggish reaction kinetics. Herein, we rationally manipulate the electronic states of the strongly electron correlated pyrochlore ruthenate Y2Ru2O7 alternative through partial A-site substitution of Sr2+ for Y3+, efficiently improving its intrinsic OER activity. The optimized Y1.7Sr0.3Ru2O7 candidate observes a highly intrinsic mass activity of 1018 A gRu-1 at an overpotential of 300 mV with excellent durability in 0.5 M H2SO4 electrolyte. Combining synchrotron-radiation X-ray spectroscopic investigations with theoretical simulations, we reveal that the electron correlations in the Ru 4d band are weakened through coordinatively geometric regulation and charge redistribution by the exotic Sr2+ cation, enabling the delocalization of Ru 4d electrons via an insulator-to-metal transition. The induced Ru-O covalency promotion and band alignment rearrangement decreases the charge transfer energy to accelerate interfacial charge transfer kinetics. Meanwhile, the chemical affinity of oxygen intermediates is also rationalized to weaken the metal-oxygen binding strength, thus lowering the energy barrier of the overall reaction. This work offers fresh insights into designing advanced solid-state electrocatalysts and underlines the versatility of electronic structure manipulation in tuning catalytic activity.
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Affiliation(s)
- Ning Zhang
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - Cong Wang
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - Jiewei Chen
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - Canyu Hu
- Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), School of Chemistry and Materials Science, and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Jun Ma
- Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), School of Chemistry and Materials Science, and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Xi Deng
- Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), School of Chemistry and Materials Science, and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Bocheng Qiu
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - Lejuan Cai
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China
| | - Yujie Xiong
- Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), School of Chemistry and Materials Science, and National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Yang Chai
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China
- The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, People's Republic of China
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12
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Lebedev N, Stehno M, Rana A, Reith P, Gauquelin N, Verbeeck J, Hilgenkamp H, Brinkman A, Aarts J. Gate-tuned anomalous Hall effect driven by Rashba splitting in intermixed LaAlO 3/GdTiO 3/SrTiO 3. Sci Rep 2021; 11:10726. [PMID: 34021190 PMCID: PMC8140084 DOI: 10.1038/s41598-021-89767-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 04/28/2021] [Indexed: 11/25/2022] Open
Abstract
The Anomalous Hall Effect (AHE) is an important quantity in determining the properties and understanding the behaviour of the two-dimensional electron system forming at the interface of SrTiO3-based oxide heterostructures. The occurrence of AHE is often interpreted as a signature of ferromagnetism, but it is becoming more and more clear that also paramagnets may contribute to AHE. We studied the influence of magnetic ions by measuring intermixed LaAlO3/GdTiO3/SrTiO3 at temperatures below 10 K. We find that, as function of gate voltage, the system undergoes a Lifshitz transition while at the same time an onset of AHE is observed. However, we do not observe clear signs of ferromagnetism. We argue the AHE to be due to the change in Rashba spin-orbit coupling at the Lifshitz transition and conclude that also paramagnetic moments which are easily polarizable at low temperatures and high magnetic fields lead to the presence of AHE, which needs to be taken into account when extracting carrier densities and mobilities.
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Affiliation(s)
- N Lebedev
- Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA, Leiden, The Netherlands
| | - M Stehno
- Physikalisches Institut (EP 3), Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - A Rana
- Center for Advanced Materials and Devices, BML Munjal University (Hero Group), Gurgaon, 122413, India
- MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - P Reith
- MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - N Gauquelin
- Electron Microscopy for Materials Science, University of Antwerp, Campus Groenenborger Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - J Verbeeck
- Electron Microscopy for Materials Science, University of Antwerp, Campus Groenenborger Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - H Hilgenkamp
- MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - A Brinkman
- MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - J Aarts
- Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA, Leiden, The Netherlands.
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13
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Meng M, Sun Y, Li Y, An Q, Wang Z, Lin Z, Yang F, Zhu X, Gao P, Guo J. Three dimensional band-filling control of complex oxides triggered by interfacial electron transfer. Nat Commun 2021; 12:2447. [PMID: 33907193 PMCID: PMC8079372 DOI: 10.1038/s41467-021-22790-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 03/29/2021] [Indexed: 11/09/2022] Open
Abstract
The d-band-filling of transition metals in complex oxides plays an essential role in determining their structural, electronic and magnetic properties. Traditionally, at the oxide heterointerface, band-filling control has been achieved via electrostatic modification in the structure of field-effect transistors or electron transfer, which is limited to the quasi-two-dimension at the interface. Here we report a three-dimensional (3D) band-filling control by changing the local lattice coordination in a designed oxide heterostructure. At the LaCoO3/LaTiO3 heterointerface, due to the Fermi level mismatch, electrons transfer from LaTiO3 to LaCoO3. This triggers destabilisation of the CoO6 octahedrons, i.e. the formation of lattice configurations with a reduced Co valence. The associated oxygen migration results in the 3D topotactic phase transition of LaCoO3. Tuned by the thickness of LaTiO3, different crystalline phases and band-fillings of Co occur, leading to the emergence of different magnetic ground states.
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Affiliation(s)
- Meng Meng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
| | - Yuanwei Sun
- International Center for Quantum Materials, and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, China
| | - Yuehui Li
- International Center for Quantum Materials, and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, China
| | - Qichang An
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Zhenzhen Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Zijian Lin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Fang Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
| | - Xuetao Zhu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.,School of Physical Sciences, University of 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. .,Collaborative Innovation Center of Quantum Matter, Beijing, China.
| | - Jiandong Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China. .,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China. .,Songshan Lake Materials Laboratory, Dongguan, Guangdong, China. .,Beijing Academy of Quantum Information Sciences, Beijing, China.
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14
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Mundet B, Domínguez C, Fowlie J, Gibert M, Triscone JM, Alexander DTL. Near-Atomic-Scale Mapping of Electronic Phases in Rare Earth Nickelate Superlattices. NANO LETTERS 2021; 21:2436-2443. [PMID: 33685129 PMCID: PMC7995248 DOI: 10.1021/acs.nanolett.0c04538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 01/29/2021] [Indexed: 06/12/2023]
Abstract
Nanoscale mapping of the distinct electronic phases characterizing the metal-insulator transition displayed by most of the rare-earth nickelate compounds is fundamental for discovering the true nature of this transition and the possible couplings that are established at the interfaces of nickelate-based heterostructures. Here, we demonstrate that this can be accomplished by using scanning transmission electron microscopy in combination with electron energy-loss spectroscopy. By tracking how the O K and Ni L edge fine structures evolve across two different NdNiO3/SmNiO3 superlattices, displaying either one or two metal-insulator transitions depending on the individual layer thickness, we are able to determine the electronic state of each of the individual constituent materials. We further map the spatial configuration associated with their metallic/insulating regions, reaching unit cell spatial resolution. With this, we estimate the width of the metallic/insulating boundaries at the NdNiO3/SmNiO3 interfaces, which is measured to be on the order of four unit cells.
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Affiliation(s)
- Bernat Mundet
- Department
of Quantum Matter Physics, University of
Geneva, 1211 Geneva, Switzerland
- Electron
Spectrometry and Microscopy Laboratory (LSME), Institute of Physics
(IPHYS), École Polytechnique Fédérale
de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Claribel Domínguez
- Department
of Quantum Matter Physics, University of
Geneva, 1211 Geneva, Switzerland
| | - Jennifer Fowlie
- Department
of Quantum Matter Physics, University of
Geneva, 1211 Geneva, Switzerland
| | - Marta Gibert
- Physik-Institut, University of Zurich, 8057 Zurich, Switzerland
| | - Jean-Marc Triscone
- Department
of Quantum Matter Physics, University of
Geneva, 1211 Geneva, Switzerland
| | - Duncan T. L. Alexander
- Electron
Spectrometry and Microscopy Laboratory (LSME), Institute of Physics
(IPHYS), École Polytechnique Fédérale
de Lausanne (EPFL), 1015 Lausanne, Switzerland
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15
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Wang L, Yang Z, Bowden ME, Freeland JW, Sushko PV, Spurgeon SR, Matthews B, Samarakoon WS, Zhou H, Feng Z, Engelhard MH, Du Y, Chambers SA. Hole-Trapping-Induced Stabilization of Ni 4 + in SrNiO 3 /LaFeO 3 Superlattices. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2005003. [PMID: 33006412 DOI: 10.1002/adma.202005003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 09/06/2020] [Indexed: 06/11/2023]
Abstract
Creating new functionality in materials containing transition metals is predicated on the ability to control the associated charge states. For a given transition metal, there is an upper limit on valence that is not exceeded under normal conditions. Here, it is demonstrated that this limit of 3+ for Ni and Fe can be exceeded via synthesis of (SrNiO3 )m /(LaFeO3 )n superlattices by tuning n and m. The Goldschmidt tolerance constraints are lifted, and SrNi4+ O3 with holes on adjacent O anions is stabilized as a perovskite at the single-unit-cell level (m = 1). Holding m = 1, spectroscopy reveals that the n = 1 superlattice contains Ni3+ and Fe4+ , whereas Ni4+ and Fe3+ are observed in the n = 5 superlattice. It is revealed that the B-site cation valences can be tuned by controlling the magnitude of the FeO6 octahedral rotations, which, in turn, determine the energy balance between Ni3+ /Fe4+ and Ni4+ /Fe3+ , thus controlling emergent electrical properties such as the band alignment and resulting hole confinement. This approach can be extended to other systems for synthesizing novel, metastable layered structures with new functionalities.
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Affiliation(s)
- Le Wang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Zhenzhong Yang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Mark E Bowden
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - John W Freeland
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Peter V Sushko
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Steven R Spurgeon
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Bethany Matthews
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Widitha S Samarakoon
- School of Chemical, Biological and Environment Engineering, Oregon State University, Corvallis, OR, 97331, USA
| | - Hua Zhou
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Zhenxing Feng
- School of Chemical, Biological and Environment Engineering, Oregon State University, Corvallis, OR, 97331, USA
| | - Mark H Engelhard
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Yingge Du
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Scott A Chambers
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
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16
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He H, Yang Z, Xu Y, Smith AT, Yang G, Sun L. Perovskite oxides as transparent semiconductors: a review. NANO CONVERGENCE 2020; 7:32. [PMID: 33006681 PMCID: PMC7532230 DOI: 10.1186/s40580-020-00242-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 09/15/2020] [Indexed: 05/05/2023]
Abstract
Traditional transparent conducting oxides (TCOs) have been widely used for various optoelectronic applications, but have the trade-off between conductivity and transmittance. Recently, perovskite oxides, with structural and chemical stability, have exhibited excellent physical properties as new TCOs. We focus on SrVO3-based perovskites with a high carrier concentration and BaSnO3-based perovskites with a high mobility for n-type TCOs. In addition, p-type perovskites are discussed, which can serve as potential future options to couple with n-type perovskites to design full perovskite based devices.
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Affiliation(s)
- Haiying He
- School of Materials Science and Hydrogen Energy, Foshan University, Foshan, 528000, China
| | - Zhihao Yang
- School of Materials Science and Hydrogen Energy, Foshan University, Foshan, 528000, China.
| | - Yonghang Xu
- School of Materials Science and Hydrogen Energy, Foshan University, Foshan, 528000, China
| | - Andrew T Smith
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA
- Department of Chemical & Biomolecular Engineering, University of Connecticut, Storrs, CT, 06269, USA
| | - Guangguang Yang
- School of Electronic Information Engineering, Foshan University, Foshan, 528000, China
| | - Luyi Sun
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA.
- Department of Chemical & Biomolecular Engineering, University of Connecticut, Storrs, CT, 06269, USA.
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17
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Mizoguchi T, Kiyohara S. Machine learning approaches for ELNES/XANES. Microscopy (Oxf) 2020; 69:92-109. [DOI: 10.1093/jmicro/dfz109] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 09/14/2019] [Accepted: 09/16/2019] [Indexed: 11/14/2022] Open
Abstract
Abstract
Materials characterization is indispensable for materials development. In particular, spectroscopy provides atomic configuration, chemical bonding and vibrational information, which are crucial for understanding the mechanism underlying the functions of a material. Despite its importance, the interpretation of spectra using human-driven methods, such as manual comparison of experimental spectra with reference/simulated spectra, is becoming difficult owing to the rapid increase in experimental spectral data. To overcome the limitations of such methods, we develop new data-driven approaches based on machine learning. Specifically, we use hierarchical clustering, a decision tree and a feedforward neural network to investigate the electron energy loss near edge structures (ELNES) spectrum, which is identical to the X-ray absorption near edge structure (XANES) spectrum. Hierarchical clustering and the decision tree are used to interpret and predict ELNES/XANES, while the feedforward neural network is used to obtain hidden information about the material structure and properties from the spectra. Further, we construct a prediction model that is robust against noise by data augmentation. Finally, we apply our method to noisy spectra and predict six properties accurately. In summary, the proposed approaches can pave the way for fast and accurate spectrum interpretation/prediction as well as local measurement of material functions.
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Affiliation(s)
- Teruyasu Mizoguchi
- Institute of Industrial Science, The University of Tokyo, Komaba, Tokyo 113-8505, Japan
| | - Shin Kiyohara
- Institute of Industrial Science, The University of Tokyo, Komaba, Tokyo 113-8505, Japan
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18
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Ren B, Wang Y, Ou JZ. Engineering two-dimensional metal oxides via surface functionalization for biological applications. J Mater Chem B 2020; 8:1108-1127. [DOI: 10.1039/c9tb02423a] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Schematic illustration of 2D MO nanosheets for applications in biosystems.
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Affiliation(s)
- Baiyu Ren
- School of Materials Science and Engineering
- Southwest Jiaotong University
- Chengdu
- China
- School of Resources and Environmental Engineering
| | - Yichao Wang
- School of Engineering
- RMIT University
- Melbourne
- Australia
| | - Jian Zhen Ou
- School of Materials Science and Engineering
- Southwest Jiaotong University
- Chengdu
- China
- School of Engineering
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19
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Liu J, Jia E, Wang L, Stoerzinger KA, Zhou H, Tang CS, Yin X, He X, Bousquet E, Bowden ME, Wee ATS, Chambers SA, Du Y. Tuning the Electronic Structure of LaNiO 3 through Alloying with Strontium to Enhance Oxygen Evolution Activity. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1901073. [PMID: 31592141 PMCID: PMC6774028 DOI: 10.1002/advs.201901073] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 07/17/2019] [Indexed: 05/21/2023]
Abstract
The perovskite oxide LaNiO3 is a promising oxygen electrocatalyst for renewable energy storage and conversion technologies. Here, it is shown that strontium substitution for lanthanum in coherently strained, epitaxial LaNiO3 films (La1- x Sr x NiO3) significantly enhances the oxygen evolution reaction (OER) activity, resulting in performance at x = 0.5 comparable to the state-of-the-art catalyst Ba0.5Sr0.5Co0.8Fe0.2O3- δ . By combining X-ray photoemission and X-ray absorption spectroscopies with density functional theory, it is shown that an upward energy shift of the O 2p band relative to the Fermi level occurs with increasing x in La1- x Sr x NiO3. This alloying step strengthens Ni 3d-O 2p hybridization and decreases the charge transfer energy, which in turn accounts for the enhanced OER activity.
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Affiliation(s)
- Jishan Liu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center for Excellence in Superconducting ElectronicsChinese Academy of SciencesShanghai200050China
- Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichlandWA99354USA
| | - Endong Jia
- Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichlandWA99354USA
- The Key Laboratory of Solar Thermal Energy and Photovoltaic SystemInstitute of Electrical EngineeringChinese Academy of SciencesBeijing100190China
- Department of PhysicsUniversity of Chinese Academy of SciencesBeijing100190China
| | - Le Wang
- Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichlandWA99354USA
| | - Kelsey A. Stoerzinger
- Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichlandWA99354USA
- School of ChemicalBiological and Environmental EngineeringOregon State UniversityCorvallisOR97331USA
| | - Hua Zhou
- X‐Ray Science DivisionAdvanced Photon SourceArgonne National LaboratoryLemontIL60439USA
| | - Chi Sin Tang
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- NUS Graduate School for Integrative Sciences and EngineeringNational University of SingaporeSingapore117456Singapore
| | - Xinmao Yin
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
| | - Xu He
- Theoretical Materials PhysicsQ‐MATCesamUniversity of LiègeB‐4000LiègeBelgium
| | - Eric Bousquet
- Theoretical Materials PhysicsQ‐MATCesamUniversity of LiègeB‐4000LiègeBelgium
| | - Mark E. Bowden
- Environmental Molecular Sciences LaboratoryPacific Northwest National LaboratoryRichlandWA99354USA
| | - Andrew T. S. Wee
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
| | - Scott A. Chambers
- Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichlandWA99354USA
| | - Yingge Du
- Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichlandWA99354USA
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20
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Kettner M, Duchoň T, Wolf MJ, Kullgren J, Senanayake SD, Hermansson K, Veltruská K, Nehasil V. Anion-mediated electronic effects in reducible oxides: Tuning the valence band of ceria via fluorine doping. J Chem Phys 2019; 151:044701. [PMID: 31370552 DOI: 10.1063/1.5109955] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Combining experimental spectroscopy and hybrid density functional theory calculations, we show that the incorporation of fluoride ions into a prototypical reducible oxide surface, namely, ceria(111), can induce a variety of nontrivial changes to the local electronic structure, beyond the expected increase in the number of Ce3+ ions. Our resonant photoemission spectroscopy results reveal new states above, within, and below the valence band, which are unique to the presence of fluoride ions at the surface. With the help of hybrid density functional calculations, we show that the different states arise from fluoride ions in different atomic layers in the near surface region. In particular, we identify a structure in which a fluoride ion substitutes for an oxygen ion at the surface, with a second fluoride ion on top of a surface Ce4+ ion giving rise to F 2p states which overlap the top of the O 2p band. The nature of this adsorbate F--Ce4+ resonant enhancement feature suggests that this bond is at least partially covalent. Our results demonstrate the versatility of anion doping as a potential means of tuning the valence band electronic structure of ceria.
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Affiliation(s)
- Miroslav Kettner
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic
| | - Tomáš Duchoň
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic
| | - Matthew J Wolf
- Department of Chemistry-Ångström Laboratory, Uppsala University, Box 538, 751 21 Uppsala, Sweden
| | - Jolla Kullgren
- Department of Chemistry-Ångström Laboratory, Uppsala University, Box 538, 751 21 Uppsala, Sweden
| | - Sanjaya D Senanayake
- Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Kersti Hermansson
- Department of Chemistry-Ångström Laboratory, Uppsala University, Box 538, 751 21 Uppsala, Sweden
| | - Kateřina Veltruská
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic
| | - Václav Nehasil
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic
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21
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Yin X, Yang M, Tang CS, Wang Q, Xu L, Wu J, Trevisanutto PE, Zeng S, Chin XY, Asmara TC, Feng YP, Ariando A, Chhowalla M, Wang SJ, Zhang W, Rusydi A, Wee ATS. Modulation of New Excitons in Transition Metal Dichalcogenide-Perovskite Oxide System. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1900446. [PMID: 31380174 PMCID: PMC6662271 DOI: 10.1002/advs.201900446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 03/31/2019] [Indexed: 06/10/2023]
Abstract
The exciton, a quasi-particle that creates a bound state of an electron and a hole, is typically found in semiconductors. It has attracted major attention in the context of both fundamental science and practical applications. Transition metal dichalcogenides (TMDs) are a new class of 2D materials that include direct band-gap semiconductors with strong spin-orbit coupling and many-body interactions. Manipulating new excitons in semiconducting TMDs could generate a novel means of application in nanodevices. Here, the observation of high-energy excitonic peaks in the monolayer-MoS2 on a SrTiO3 heterointerface generated by a new complex mechanism is reported, based on a comprehensive study that comprises temperature-dependent optical spectroscopies and first-principles calculations. The appearance of these excitons is attributed to the change in many-body interactions that occurs alongside the interfacial orbital hybridization and spin-orbit coupling brought about by the excitonic effect propagated from the substrate. This has further led to the formation of a Fermi-surface feature at the interface. The results provide an atomic-scale understanding of the heterointerface between monolayer-TMDs and perovskite oxide and highlight the importance of spin-orbit-charge-lattice coupling on the intrinsic properties of atomic-layer heterostructures, which open up a way to manipulate the excitonic effects in monolayer TMDs via an interfacial system.
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Affiliation(s)
- Xinmao Yin
- International Collaborative Laboratory of 2D Materials for Optoelectronics Science and TechnologyShenzhen UniversityShenzhen518060China
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- Singapore Synchrotron Light Source (SSLS)National University of SingaporeSingapore117603Singapore
| | - Ming Yang
- Institute of Materials Research and EngineeringA∗STAR (Agency for Science, Technology and Research)2 Fusionopolis WaySingapore138634Singapore
| | - Chi Sin Tang
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- NUS Graduate School for Integrative Sciences and EngineeringNational University of SingaporeSingapore117456Singapore
| | - Qixing Wang
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
| | - Lei Xu
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
| | - Jing Wu
- Institute of Materials Research and EngineeringA∗STAR (Agency for Science, Technology and Research)2 Fusionopolis WaySingapore138634Singapore
| | - Paolo Emilio Trevisanutto
- Centre for Advanced 2D Materials and Graphene Research CentreNational University of SingaporeSingapore117551Singapore
| | - Shengwei Zeng
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- NUSNNI‐NanoCoreNational University of SingaporeSingapore117576Singapore
| | - Xin Yu Chin
- Energy Research Institute @ NTU (ERI@N)Research Techno PlazaX‐Frontier Block, Level 5, 50 Nanyang DriveSingapore637553Singapore
| | - Teguh Citra Asmara
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- Singapore Synchrotron Light Source (SSLS)National University of SingaporeSingapore117603Singapore
| | - Yuan Ping Feng
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- Centre for Advanced 2D Materials and Graphene Research CentreNational University of SingaporeSingapore117551Singapore
| | - Ariando Ariando
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- NUS Graduate School for Integrative Sciences and EngineeringNational University of SingaporeSingapore117456Singapore
- NUSNNI‐NanoCoreNational University of SingaporeSingapore117576Singapore
| | - Manish Chhowalla
- Department of Materials Science and MetallurgyUniversity of CambridgeCambridgeCB30FSUK
| | - Shi Jie Wang
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- Institute of Materials Research and EngineeringA∗STAR (Agency for Science, Technology and Research)2 Fusionopolis WaySingapore138634Singapore
| | - Wenjing Zhang
- International Collaborative Laboratory of 2D Materials for Optoelectronics Science and TechnologyShenzhen UniversityShenzhen518060China
| | - Andrivo Rusydi
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- Singapore Synchrotron Light Source (SSLS)National University of SingaporeSingapore117603Singapore
- NUS Graduate School for Integrative Sciences and EngineeringNational University of SingaporeSingapore117456Singapore
- NUSNNI‐NanoCoreNational University of SingaporeSingapore117576Singapore
| | - Andrew T. S. Wee
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117542Singapore
- Singapore Synchrotron Light Source (SSLS)National University of SingaporeSingapore117603Singapore
- NUS Graduate School for Integrative Sciences and EngineeringNational University of SingaporeSingapore117456Singapore
- Centre for Advanced 2D Materials and Graphene Research CentreNational University of SingaporeSingapore117551Singapore
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22
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Liang X, Shi L, Liu Y, Chen H, Si R, Yan W, Zhang Q, Li G, Yang L, Zou X. Activating Inert, Nonprecious Perovskites with Iridium Dopants for Efficient Oxygen Evolution Reaction under Acidic Conditions. Angew Chem Int Ed Engl 2019; 58:7631-7635. [DOI: 10.1002/anie.201900796] [Citation(s) in RCA: 113] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Xiao Liang
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Lei Shi
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Yipu Liu
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Hui Chen
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Rui Si
- Shanghai Synchrotron Radiation FacilityShanghai Institute of Applied PhysicsChinese Academy of Sciences Shanghai 201204 P. R. China
| | - Wensheng Yan
- National Synchrotron Radiation LaboratoryUniversity of Science and Technology of China Hefei Anhui 230029 P. R. China
| | - Qi Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Guo‐Dong Li
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Li Yang
- State Key Laboratory of Molecular Reaction DynamicsDalian Institute of Chemical Physics Dalian 116023 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Xiaoxin Zou
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
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23
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Kumar S, Mondal C, Pathak B. Double-Exchange Magnetic Interactions in High-Temperature Ferromagnetic Iron Chalcogenide Monolayers. Chemphyschem 2019; 20:873-880. [PMID: 30724434 DOI: 10.1002/cphc.201900002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Indexed: 11/07/2022]
Abstract
Smythite ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub><mml:mrow><mml:mi>F</mml:mi> <mml:mi>e</mml:mi></mml:mrow> <mml:mn>3</mml:mn></mml:msub> <mml:msub><mml:mi>S</mml:mi> <mml:mn>4</mml:mn></mml:msub> </mml:mrow> </mml:math> ) is an iron-based chalcogenide with a lamellar structure, different from the compositionally identical mineral greigite. Owing to their natural abundance, such transition metal chalcogenides are promising materials for low-cost spintronic-based devices. Herein, we discuss the charge transfer processes and complex magnetic ordering in a two-dimensional (2D) smythite lattice. We find that <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>F</mml:mi> <mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow> <mml:mrow><mml:mn>2</mml:mn> <mml:mo>+</mml:mo></mml:mrow> </mml:msup> <mml:mo>/</mml:mo> <mml:mi>F</mml:mi> <mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow> <mml:mrow><mml:mn>3</mml:mn> <mml:mo>+</mml:mo></mml:mrow> </mml:msup> </mml:mrow> </mml:math> redox couple and complex magnetic ordering are governing factors in the charge transfer processes. A very strong ferromagnetic in-lattice coupling is also observed, which is attributed to the presence of three Fe-centres. To describe the magnetic behaviour molecular and periodic approaches have been considered. We found a substantial increase in Curie temperature with applied mechanical stress due to opening of the double exchange interaction angle. We also observe an in-plane Jahn-Teller distortion, which is further confirmed by the spin-orbit counter plot. Our study thus provides an insight into the double exchange mechanism favoured by the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>F</mml:mi> <mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow> <mml:mrow><mml:mn>2</mml:mn> <mml:mo>+</mml:mo></mml:mrow> </mml:msup> <mml:mo>/</mml:mo> <mml:mi>F</mml:mi> <mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow> <mml:mrow><mml:mn>3</mml:mn> <mml:mo>+</mml:mo></mml:mrow> </mml:msup> </mml:mrow> </mml:math> redox couple and results in a strong ferromagnetic ordering.
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Affiliation(s)
- Sourabh Kumar
- Discipline of Chemistry, Indian Institute of Technology (IIT), Indore, Indore, 453552, India
| | - Chiranjit Mondal
- Discipline of Metallurgy Engineering and Material Science, Indian Institute of Technology (IIT), Indore, Indore, 453552, India
| | - Biswarup Pathak
- Discipline of Chemistry, Indian Institute of Technology (IIT), Indore, Indore, 453552, India.,Discipline of Metallurgy Engineering and Material Science, Indian Institute of Technology (IIT), Indore, Indore, 453552, India
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24
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Lan D, Chen B, Qu L, Jin F, Guo Z, Xu L, Zhang K, Gao G, Chen F, Jin S, Wang L, Wu W. Interfacial Engineering of Ferromagnetism in Epitaxial Manganite/Ruthenate Superlattices via Interlayer Chemical Doping. ACS APPLIED MATERIALS & INTERFACES 2019; 11:10399-10408. [PMID: 30775907 DOI: 10.1021/acsami.8b22055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Interfacial charge transfer and structural proximity effects are the two essential routes to trigger and tune numerous functionalities of perovskite oxide heterostructures. However, the cooperation and competition of these two interfacial effects in one epitaxial system have not been fully understood. Herein, we fabricate a series of La0.67Ca0.33MnO3/CaRuO3 superlattices and introduce various chemical doping in the nonmagnetic CaRuO3 interlayers. We found that Ti, Sr, and La doping in the CaRuO3 layer can effectively tune the interfacial charge transfer and octahedral rotation, thus modulating the ferromagnetism of the superlattices. Specifically, the B-site Ti doping depletes the Ru 4d band and suppresses the interfacial charge transfer, leading to a decay of ferromagnetic Curie temperature ( TC). In contrast, the A-site Sr doping maintains a sizable charge transfer and meanwhile suppresses the octahedral rotation, which facilitates ferromagnetism and significantly enhances the TC up to 291 K. The La doping turns out to localize the itinerant electrons in the CaRuO3 layer, which suppresses both the interfacial charge transfer and ferromagnetism. The observed intriguing interfacial engineering of magnetism would pave a new way to understand the collective effects of interfacial charge transfer and structural proximity on the physical properties of oxide heterostructures.
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Affiliation(s)
- Da Lan
- Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Binbin Chen
- Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - LiLi Qu
- Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Feng Jin
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory and Hefei Science Center , Chinese Academy of Sciences , Hefei 230031 , China
| | - Zhuang Guo
- Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Liqiang Xu
- Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Kexuan Zhang
- Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Guanyin Gao
- Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Feng Chen
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory and Hefei Science Center , Chinese Academy of Sciences , Hefei 230031 , China
| | - Shaowei Jin
- Institute of Physical Science and Information Technology , Anhui University , Hefei 230601 , China
| | - Lingfei Wang
- Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Wenbin Wu
- Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory and Hefei Science Center , Chinese Academy of Sciences , Hefei 230031 , China
- Institute of Physical Science and Information Technology , Anhui University , Hefei 230601 , China
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25
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Tesch MF, Bonke SA, Jones TE, Shaker MN, Xiao J, Skorupska K, Mom R, Melder J, Kurz P, Knop‐Gericke A, Schlögl R, Hocking RK, Simonov AN. Evolution of Oxygen–Metal Electron Transfer and Metal Electronic States During Manganese Oxide Catalyzed Water Oxidation Revealed with In Situ Soft X‐Ray Spectroscopy. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201810825] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Marc F. Tesch
- Institut Methoden der MaterialentwicklungHelmholtz Zentrum Berlin für Materialien und Energie Albert-Einstein-Straße 15 12489 Berlin Germany
- Abteilung Heterogene ReaktionenMax-Planck-Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Germany
| | - Shannon A. Bonke
- School of Chemistry and the ARC Centre of Excellence for, Electromaterials ScienceMonash University Victoria 3800 Australia
- Institut NanospektroskopieHelmholtz-Zentrum Berlin für Materialien und Energie Kekuléstraße 5 12489 Berlin Germany
- EPR Research GroupMax-Planck-Institut für Chemische Energiekonversion Stiftstraße 34-36 45470 Mülheim an der Ruhr Germany
| | - Travis E. Jones
- Abteilung Anorganische ChemieFritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Germany
| | - Maryam N. Shaker
- Institut Methoden der MaterialentwicklungHelmholtz Zentrum Berlin für Materialien und Energie Albert-Einstein-Straße 15 12489 Berlin Germany
- Freie Universität BerlinFachbereich Physik Arnimallee 14 14159 Berlin Germany
| | - Jie Xiao
- Institut Methoden der MaterialentwicklungHelmholtz Zentrum Berlin für Materialien und Energie Albert-Einstein-Straße 15 12489 Berlin Germany
| | - Katarzyna Skorupska
- Abteilung Heterogene ReaktionenMax-Planck-Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Germany
- Abteilung Anorganische ChemieFritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Germany
| | - Rik Mom
- Abteilung Anorganische ChemieFritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Germany
| | - Jens Melder
- Institut für Anorganische und Analytische Chemie and Freiburger MaterialforschungszentrumAlbert-Ludwigs-Universität Freiburg Albertstraße 21 79104 Freiburg Germany
| | - Philipp Kurz
- Institut für Anorganische und Analytische Chemie and Freiburger MaterialforschungszentrumAlbert-Ludwigs-Universität Freiburg Albertstraße 21 79104 Freiburg Germany
| | - Axel Knop‐Gericke
- Abteilung Anorganische ChemieFritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Germany
| | - Robert Schlögl
- Abteilung Heterogene ReaktionenMax-Planck-Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Germany
- Abteilung Anorganische ChemieFritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Germany
| | - Rosalie K. Hocking
- Department of Chemistry and BiotechnologySwinburne University of Technology John Street Hawthorn Victoria 3122 Australia
| | - Alexandr N. Simonov
- School of Chemistry and the ARC Centre of Excellence for, Electromaterials ScienceMonash University Victoria 3800 Australia
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26
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Liang X, Shi L, Liu Y, Chen H, Si R, Yan W, Zhang Q, Li G, Yang L, Zou X. Activating Inert, Nonprecious Perovskites with Iridium Dopants for Efficient Oxygen Evolution Reaction under Acidic Conditions. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900796] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xiao Liang
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Lei Shi
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Yipu Liu
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Hui Chen
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Rui Si
- Shanghai Synchrotron Radiation FacilityShanghai Institute of Applied PhysicsChinese Academy of Sciences Shanghai 201204 P. R. China
| | - Wensheng Yan
- National Synchrotron Radiation LaboratoryUniversity of Science and Technology of China Hefei Anhui 230029 P. R. China
| | - Qi Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Guo‐Dong Li
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
| | - Li Yang
- State Key Laboratory of Molecular Reaction DynamicsDalian Institute of Chemical Physics Dalian 116023 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Xiaoxin Zou
- State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
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27
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Tesch MF, Bonke SA, Jones TE, Shaker MN, Xiao J, Skorupska K, Mom R, Melder J, Kurz P, Knop-Gericke A, Schlögl R, Hocking RK, Simonov AN. Evolution of Oxygen-Metal Electron Transfer and Metal Electronic States During Manganese Oxide Catalyzed Water Oxidation Revealed with In Situ Soft X-Ray Spectroscopy. Angew Chem Int Ed Engl 2019; 58:3426-3432. [PMID: 30589176 DOI: 10.1002/anie.201810825] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Indexed: 11/07/2022]
Abstract
Manganese oxide (MnOx ) electrocatalysts are examined herein by in situ soft X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) during the oxidation of water buffered by borate (pH 9.2) at potentials from 0.75 to 2.25 V vs. the reversible hydrogen electrode. Correlation of L-edge XAS data with previous mechanistic studies indicates MnIV is the highest oxidation state involved in the catalytic mechanism. MnOx is transformed into birnessite at 1.45 V and does not undergo further structural phase changes. At potentials beyond this transformation, RIXS spectra show progressive enhancement of charge transfer transitions from oxygen to manganese. Theoretical analysis of these data indicates increased hybridization of the Mn-O orbitals and withdrawal of electron density from the O ligand shell. In situ XAS experiments at the O K-edge provide complementary evidence for such a transition. This step is crucial for the formation of O2 from water.
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Affiliation(s)
- Marc F Tesch
- Institut Methoden der Materialentwicklung, Helmholtz Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489, Berlin, Germany.,Abteilung Heterogene Reaktionen, Max-Planck-Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Shannon A Bonke
- School of Chemistry and the ARC Centre of Excellence for, Electromaterials Science, Monash University, Victoria, 3800, Australia.,Institut Nanospektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße 5, 12489, Berlin, Germany.,EPR Research Group, Max-Planck-Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Travis E Jones
- Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Maryam N Shaker
- Institut Methoden der Materialentwicklung, Helmholtz Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489, Berlin, Germany.,Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14159, Berlin, Germany
| | - Jie Xiao
- Institut Methoden der Materialentwicklung, Helmholtz Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489, Berlin, Germany
| | - Katarzyna Skorupska
- Abteilung Heterogene Reaktionen, Max-Planck-Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470, Mülheim an der Ruhr, Germany.,Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Rik Mom
- Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Jens Melder
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104, Freiburg, Germany
| | - Philipp Kurz
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104, Freiburg, Germany
| | - Axel Knop-Gericke
- Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Robert Schlögl
- Abteilung Heterogene Reaktionen, Max-Planck-Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470, Mülheim an der Ruhr, Germany.,Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Rosalie K Hocking
- Department of Chemistry and Biotechnology, Swinburne University of Technology, John Street, Hawthorn, Victoria, 3122, Australia
| | - Alexandr N Simonov
- School of Chemistry and the ARC Centre of Excellence for, Electromaterials Science, Monash University, Victoria, 3800, Australia
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28
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Liao Z, Skoropata E, Freeland JW, Guo EJ, Desautels R, Gao X, Sohn C, Rastogi A, Ward TZ, Zou T, Charlton T, Fitzsimmons MR, Lee HN. Large orbital polarization in nickelate-cuprate heterostructures by dimensional control of oxygen coordination. Nat Commun 2019; 10:589. [PMID: 30718483 PMCID: PMC6362240 DOI: 10.1038/s41467-019-08472-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 01/08/2019] [Indexed: 12/04/2022] Open
Abstract
Artificial heterostructures composed of dissimilar transition metal oxides provide unprecedented opportunities to create remarkable physical phenomena. Here, we report a means to deliberately control the orbital polarization in LaNiO3 (LNO) through interfacing with SrCuO2 (SCO), which has an infinite-layer structure for CuO2. Dimensional control of SCO results in a planar-type (P–SCO) to chain-type (C–SCO) structure transition depending on the SCO thickness. This transition is exploited to induce either a NiO5 pyramidal or a NiO6 octahedral structure at the SCO/LNO interface. Consequently, a large change in the Ni d orbital occupation up to ~30% is achieved in P–SCO/LNO superlattices, whereas the Ni eg orbital splitting is negligible in C–SCO/LNO superlattices. The engineered oxygen coordination triggers a metal-to-insulator transition in SCO/LNO superlattices. Our results demonstrate that interfacial oxygen coordination engineering provides an effective means to manipulate the orbital configuration and associated physical properties, paving a pathway towards the advancement of oxide electronics. In correlated materials, physical properties depend on orbital occupancy and polarization. Here, a way to control the oxygen coordination via dimensionality of superlattices is presented that results in the change of orbital occupancy by 30%, which is larger than what has been achieved by other methods.
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Affiliation(s)
- Zhaoliang Liao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Elizabeth Skoropata
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - J W Freeland
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, United States
| | - Er-Jia Guo
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Ryan Desautels
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Xiang Gao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Changhee Sohn
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Ankur Rastogi
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - T Zac Ward
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Tao Zou
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Timothy Charlton
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States
| | - Michael R Fitzsimmons
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States.,Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, United States
| | - Ho Nyung Lee
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States.
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29
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Terashima K, Paris E, Salas-Colera E, Simonelli L, Joseph B, Wakita T, Horigane K, Fujii M, Kobayashi K, Horie R, Akimitsu J, Muraoka Y, Yokoya T, Saini NL. Determination of the local structure of Sr 2-xM xIrO 4 (M = K, La) as a function of doping and temperature. Phys Chem Chem Phys 2018; 20:23783-23788. [PMID: 30199083 DOI: 10.1039/c8cp03756f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The local structure of correlated spin-orbit insulator Sr2-xMxIrO4 (M = K, La) has been investigated by Ir L3-edge extended X-ray absorption fine structure measurements. The measurements were performed as a function of temperature for different dopings induced by substitution of Sr with La or K. It is found that Ir-O bonds have strong covalency and they hardly show any change across the Néel temperature. In the studied doping range, neither Ir-O bonds nor their dynamics, measured by their mean square relative displacements, show any appreciable change upon carrier doping, indicating the possibility of nanoscale phase separation in the doped system. On the other hand, there is a large increase of the static disorder in Ir-Sr correlation, larger for K doping than La doping. Similarities and differences with respect to the local lattice displacements in cuprates are briefly discussed.
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Affiliation(s)
- Kensei Terashima
- Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan.
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30
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Xu Z, Hu S, Wu R, Wang JO, Wu T, Chen L. Strain-Enhanced Charge Transfer and Magnetism at a Manganite/Nickelate Interface. ACS APPLIED MATERIALS & INTERFACES 2018; 10:30803-30810. [PMID: 30130085 DOI: 10.1021/acsami.8b06949] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The strain effect on charge transfer in correlated oxide La0.8Sr0.2MnO3/NdNiO3 (LSMO/NNO) heterostructures is investigated. This is achieved by carefully tailoring the strain on the two layers using various substrates. In contrast to bare LSMO films, the strain dependence of the enhanced magnetic moment of the LSMO/NNO bilayers strongly suggests that the charge transfer can be controlled via strain engineering in complex oxide heterostructures. Furthermore, our study also reveals that the coercive field, exchange bias, and conductivity are dramatically affected by the strain-modulated charge transfer in LSMO/NNO heterostructures. Our work thus points out a new path to control electronic states in oxide heterostructures to advance the use of interfaces in oxide-based electronics.
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Affiliation(s)
- Zedong Xu
- Department of Physics , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , China
| | - Songbai Hu
- Department of Physics , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , China
| | - Rui Wu
- Laboratory of Synchrotron Radiation , Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100039 , China
| | - Jia-Ou Wang
- Laboratory of Synchrotron Radiation , Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100039 , China
| | - Tom Wu
- School of Materials Science and Engineering , UNSW Australia , Sydney , New South Wales 2052 , Australia
| | - Lang Chen
- Department of Physics , Southern University of Science and Technology , Shenzhen , Guangdong 518055 , China
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31
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Metal-insulator-transition engineering by modulation tilt-control in perovskite nickelates for room temperature optical switching. Proc Natl Acad Sci U S A 2018; 115:9515-9520. [PMID: 30185557 PMCID: PMC6156682 DOI: 10.1073/pnas.1807457115] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Correlated transition metal oxide perovskites receive a lot of attention due to their unique physical properties, which are largely driven by distortion of the BO6 octahedral network. In bulk, the control of the octahedral network is normally obtained by cation substitutions in a random alloy. Similar to the charge donors in semiconductors, cation substitutions will introduce scattering and disorder. The development of artificial heterostructures offers unprecedented opportunities to lattice engineering to achieve desired properties. In this work, we demonstrated a structural analogue of modulation doping in nickelate heterostructures through the interfacial transfer of tilt patterns. Modulation tilt control was used to remotely control the Ni–O bonds in the compound SmNiO3 and thereby its critical temperature for optimal optical switching application. In transition metal perovskites ABO3, the physical properties are largely driven by the rotations of the BO6 octahedra, which can be tuned in thin films through strain and dimensionality control. However, both approaches have fundamental and practical limitations due to discrete and indirect variations in bond angles, bond lengths, and film symmetry by using commercially available substrates. Here, we introduce modulation tilt control as an approach to tune the ground state of perovskite oxide thin films by acting explicitly on the oxygen octahedra rotation modes—that is, directly on the bond angles. By intercalating the prototype SmNiO3 target material with a tilt-control layer, we cause the system to change the natural amplitude of a given rotation mode without affecting the interactions. In contrast to strain and dimensionality engineering, our method enables a continuous fine-tuning of the materials’ properties. This is achieved through two independent adjustable parameters: the nature of the tilt-control material (through its symmetry, elastic constants, and oxygen rotation angles), and the relative thicknesses of the target and tilt-control materials. As a result, a magnetic and electronic phase diagram can be obtained, normally only accessible by A-site element substitution, within the single SmNiO3 compound. With this unique approach, we successfully adjusted the metal–insulator transition (MIT) to room temperature to fulfill the desired conditions for optical switching applications.
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32
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Rueff JP, Rault JE, Ablett JM, Utsumi Y, Céolin D. HAXPES for Materials Science at the GALAXIES Beamline. ACTA ACUST UNITED AC 2018. [DOI: 10.1080/08940886.2018.1483648] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- J.-P. Rueff
- Synchrotron SOLEIL, Gif sur Yvette, France
- Sorbonne Université, CNRS, Paris, France
| | | | | | - Y. Utsumi
- Synchrotron SOLEIL, Gif sur Yvette, France
| | - D. Céolin
- Synchrotron SOLEIL, Gif sur Yvette, France
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33
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Aeschlimann R, Preziosi D, Scheiderer P, Sing M, Valencia S, Santamaria J, Luo C, Ryll H, Radu F, Claessen R, Piamonteze C, Bibes M. A Living-Dead Magnetic Layer at the Surface of Ferrimagnetic DyTiO 3 Thin Films. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707489. [PMID: 29847701 DOI: 10.1002/adma.201707489] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 03/09/2018] [Indexed: 06/08/2023]
Abstract
When ferromagnetic films become ultrathin, key properties such as the Curie temperature and the saturation magnetization are usually depressed. This effect is thoroughly investigated in magnetic oxides such as half-metallic manganites, but much less in ferrimagnetic insulating perovskites such as rare-earth titanates RTiO3 , despite their appeal to design correlated 2D electron gases. Here, the magnetic properties of epitaxial DyTiO3 thin films are reported. While films thicker than about 50 nm show a bulk-like response, at low thickness a surprising increase of the saturation magnetization is observed. This behavior is described using a classical model of a "dead layer" but assuming that this layer is actually "living," that is, it responds to the magnetic field with a strong paramagnetic susceptibility. Through depth-dependent X-ray absorption and photoemission spectroscopy, it is shown that the "living-dead layer" corresponds to surface regions where magnetic (S = 1/2) Ti3+ ions are replaced by nonmagnetic Ti4+ ions. Hysteresis cycles at the Dy M 5 and Ti L 3 edges indicate that the surface Ti4+ ions decouple the Dy3+ ions, thus unleashing their strong paramagnetic response. Finally, it is shown how capping the DyTiO3 film can help increase the Ti3+ content near the surface and thus recover a better ferrimagnetic behavior.
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Affiliation(s)
- Raphaël Aeschlimann
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - Daniele Preziosi
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - Philipp Scheiderer
- Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Michael Sing
- Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Sergio Valencia
- Helmholtz-Zentrum Berlin für Materialien and Energie, Albert-Einstein-Strasse 15, 12489, Berlin, Germany
| | - Jacobo Santamaria
- GFMC, Dpto. Física de Materiales, Universidad Complutense de Madrid Madrid, 28040, Spain
| | - Chen Luo
- Helmholtz-Zentrum Berlin für Materialien and Energie, Albert-Einstein-Strasse 15, 12489, Berlin, Germany
- Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, D-93053, Regensburg, Germany
| | - Hanjo Ryll
- Helmholtz-Zentrum Berlin für Materialien and Energie, Albert-Einstein-Strasse 15, 12489, Berlin, Germany
| | - Florin Radu
- Helmholtz-Zentrum Berlin für Materialien and Energie, Albert-Einstein-Strasse 15, 12489, Berlin, Germany
| | - Ralph Claessen
- Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Cinthia Piamonteze
- Swiss Light Source, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
| | - Manuel Bibes
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
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34
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Catalano S, Gibert M, Fowlie J, Íñiguez J, Triscone JM, Kreisel J. Rare-earth nickelates RNiO 3: thin films and heterostructures. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2018; 81:046501. [PMID: 29266004 DOI: 10.1088/1361-6633/aaa37a] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This review stands in the larger framework of functional materials by focussing on heterostructures of rare-earth nickelates, described by the chemical formula RNiO3 where R is a trivalent rare-earth R = La, Pr, Nd, Sm, …, Lu. Nickelates are characterized by a rich phase diagram of structural and physical properties and serve as a benchmark for the physics of phase transitions in correlated oxides where electron-lattice coupling plays a key role. Much of the recent interest in nickelates concerns heterostructures, that is single layers of thin film, multilayers or superlattices, with the general objective of modulating their physical properties through strain control, confinement or interface effects. We will discuss the extensive studies on nickelate heterostructures as well as outline different approaches to tuning and controlling their physical properties and, finally, review application concepts for future devices.
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Affiliation(s)
- S Catalano
- DQMP, Université de Genève, 24 Quai Ernest-Ansermet, 1211 Geneva, Switzerland
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35
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Guo EJ, Liu Y, Sohn C, Desautels RD, Herklotz A, Liao Z, Nichols J, Freeland JW, Fitzsimmons MR, Lee HN. Oxygen Diode Formed in Nickelate Heterostructures by Chemical Potential Mismatch. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1705904. [PMID: 29512212 DOI: 10.1002/adma.201705904] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 12/25/2017] [Indexed: 06/08/2023]
Abstract
Deliberate control of oxygen vacancy formation and migration in perovskite oxide thin films is important for developing novel electronic and iontronic devices. Here, it is found that the concentration of oxygen vacancies (VO ) formed in LaNiO3 (LNO) during pulsed laser deposition is strongly affected by the chemical potential mismatch between the LNO film and its proximal layers. Increasing the VO concentration in LNO significantly modifies the degree of orbital polarization and drives the metal-insulator transition. Changes in the nickel oxidization state and carrier concentration in the films are confirmed by soft X-ray absorption spectroscopy and optical spectroscopy. The ability to unidirectional-control the oxygen flow across the heterointerface, e.g., a so-called "oxygen diode", by exploiting chemical potential mismatch at interfaces provides a new avenue to tune the physical and electrochemical properties of complex oxides.
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Affiliation(s)
- Er-Jia Guo
- Materials Science and Technology Division and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Yaohua Liu
- Materials Science and Technology Division and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Changhee Sohn
- Materials Science and Technology Division and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Ryan D Desautels
- Materials Science and Technology Division and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Andreas Herklotz
- Materials Science and Technology Division and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Zhaoliang Liao
- Materials Science and Technology Division and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - John Nichols
- Materials Science and Technology Division and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - John W Freeland
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Michael R Fitzsimmons
- Materials Science and Technology Division and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA
| | - Ho Nyung Lee
- Materials Science and Technology Division and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
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36
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Duma AD, Wu YC, Su WN, Pan CJ, Tsai MC, Chen HM, Lee JF, Sheu HS, Ho VTT, Hwang BJ. In Situ Confined Synthesis of Ti4
O7
Supported Platinum Electrocatalysts with Enhanced Activity and Stability for the Oxygen Reduction Reaction. ChemCatChem 2018. [DOI: 10.1002/cctc.201701503] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Alemayehu Dubale Duma
- Nanoelectrochemistry Laboratory, Department of Chemical Engineering; National Taiwan University of Science and Technology; Taipei 106 Taiwan
| | - Yi-Chen Wu
- Nanoelectrochemistry Laboratory, Department of Chemical Engineering; National Taiwan University of Science and Technology; Taipei 106 Taiwan
| | - Wei-Nien Su
- Nanoelectrochemistry Laboratory, Graduate Institute of Applied Science and Technology; National Taiwan University of Science and Technology; Taipei 106 Taiwan
| | - Chun-Jern Pan
- Nanoelectrochemistry Laboratory, Department of Chemical Engineering; National Taiwan University of Science and Technology; Taipei 106 Taiwan
| | - Meng-Che Tsai
- Nanoelectrochemistry Laboratory, Department of Chemical Engineering; National Taiwan University of Science and Technology; Taipei 106 Taiwan
| | - Hung-Ming Chen
- Nanoelectrochemistry Laboratory, Department of Chemical Engineering; National Taiwan University of Science and Technology; Taipei 106 Taiwan
| | - Jyh-Fu Lee
- National Synchrotron Radiation Research Center; Hsinchu 30076 Taiwan
| | - Hwo-Shuenn Sheu
- National Synchrotron Radiation Research Center; Hsinchu 30076 Taiwan
| | - Van Thi Thanh Ho
- Nanoelectrochemistry Laboratory, Department of Chemical Engineering; National Taiwan University of Science and Technology; Taipei 106 Taiwan
| | - Bing-Joe Hwang
- Nanoelectrochemistry Laboratory, Department of Chemical Engineering; National Taiwan University of Science and Technology; Taipei 106 Taiwan
- National Synchrotron Radiation Research Center; Hsinchu 30076 Taiwan
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37
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Structurally triggered metal-insulator transition in rare-earth nickelates. Nat Commun 2017; 8:1677. [PMID: 29167437 PMCID: PMC5700091 DOI: 10.1038/s41467-017-01811-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 10/15/2017] [Indexed: 11/09/2022] Open
Abstract
Rare-earth nickelates form an intriguing series of correlated perovskite oxides. Apart from LaNiO3, they exhibit on cooling a sharp metal-insulator electronic phase transition, a concurrent structural phase transition, and a magnetic phase transition toward an unusual antiferromagnetic spin order. Appealing for various applications, full exploitation of these compounds is still hampered by the lack of global understanding of the interplay between their electronic, structural, and magnetic properties. Here we show from first-principles calculations that the metal-insulator transition of nickelates arises from the softening of an oxygen-breathing distortion, structurally triggered by oxygen-octahedra rotation motions. The origin of such a rare triggered mechanism is traced back in their electronic and magnetic properties, providing a united picture. We further develop a Landau model accounting for the metal-insulator transition evolution in terms of the rare-earth cations and rationalizing how to tune this transition by acting on oxygen rotation motions. Applications of rare-earth nickelates are hampered by lack of global understanding of the interplay among various degrees of freedom. Here, Mercy et al. propose that the metal-insulator transition of nickelates arises from the softening of an oxygen breathing distortion, providing a united picture of electronic, structural and magnetic properties.
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38
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Chen H, Millis A. Design of new Mott multiferroics via complete charge transfer: promising candidates for bulk photovoltaics. Sci Rep 2017; 7:6142. [PMID: 28733597 PMCID: PMC5522466 DOI: 10.1038/s41598-017-06396-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 06/09/2017] [Indexed: 11/10/2022] Open
Abstract
Optimal materials to induce bulk photovoltaic effects should lack inversion symmetry and have an optical gap matching the energies of visible radiation. Ferroelectric perovskite oxides such as BaTiO3 and PbTiO3 exhibit substantial polarization and stability, but have the disadvantage of excessively large band gaps. We use both density functional theory and dynamical mean field theory calculations to design a new class of Mott multiferroics–double perovskite oxides A2VFeO6 (A = Ba, Pb, etc). While neither perovskite AVO3 nor AFeO3 is ferroelectric, in the double perovskite A2VFeO6 a ‘complete’ charge transfer from V to Fe leads to a non-bulk-like charge configuration–an empty V-d shell and a half-filled Fe-d shell, giving rise to a polarization comparable to that of ferroelectric ATiO3. Different from nonmagnetic ATiO3, the new double perovskite oxides have an antiferromagnetic ground state and around room temperatures, are paramagnetic Mott insulators. Most importantly, the V d0 state significantly reduces the band gap of A2VFeO6, making it smaller than that of ATiO3 and BiFeO3 and rendering the new multiferroics a promising candidate to induce bulk photovoltaic effects.
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Affiliation(s)
- Hanghui Chen
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai, 200062, China. .,Department of Physics, New York University, New York, NY, 10002, USA.
| | - Andrew Millis
- Department of Physics, Columbia University, New York, NY, 10027, USA
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39
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Chen H, Millis A. Charge transfer driven emergent phenomena in oxide heterostructures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:243001. [PMID: 28437253 DOI: 10.1088/1361-648x/aa6efe] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Complex oxides exhibit many intriguing phenomena, including metal-insulator transition, ferroelectricity/multiferroicity, colossal magnetoresistance and high transition temperature superconductivity. Advances in epitaxial thin film growth techniques enable us to combine different complex oxides with atomic precision and form an oxide heterostructure. Recent theoretical and experimental work has shown that charge transfer across oxide interfaces generally occurs and leads to a great diversity of emergent interfacial properties which are not exhibited by bulk constituents. In this report, we review mechanisms and physical consequence of charge transfer across interfaces in oxide heterostructures. Both theoretical proposals and experimental measurements of various oxide heterostructures are discussed and compared. We also review the theoretical methods that are used to calculate charge transfer across oxide interfaces and discuss the success and challenges in theory. Finally, we present a summary and perspectives for future research.
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Affiliation(s)
- Hanghui Chen
- NYU-ECNU Institute of Physics, New York University Shanghai, 200062, People's Republic of China. Department of Physics, New York University, New York, NY 10002, United States of America
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40
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Factors Controlling the Redox Activity of Oxygen in Perovskites: From Theory to Application for Catalytic Reactions. Catalysts 2017. [DOI: 10.3390/catal7050149] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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41
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Zhao S, Zhou Z, Peng B, Zhu M, Feng M, Yang Q, Yan Y, Ren W, Ye ZG, Liu Y, Liu M. Quantitative Determination on Ionic-Liquid-Gating Control of Interfacial Magnetism. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1606478. [PMID: 28256772 DOI: 10.1002/adma.201606478] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/19/2017] [Indexed: 06/06/2023]
Abstract
Ionic-liquid gating on a functional thin film with a low voltage has drawn a lot of attention due to rich chemical, electronic, and magnetic phenomena at the interface. Here, a key challenge in quantitative determination of voltage-controlled magnetic anisotropy (VCMA) in Au/[DEME]+ [TFSI]- /Co field-effect transistor heterostructures is addressed. The magnetic anisotropy change as response to the gating voltage is precisely detected by in situ electron spin resonance measurements. A reversible change of magnetic anisotropy up to 219 Oe is achieved with a low gating voltage of 1.5 V at room temperature, corresponding to a record high VCMA coefficient of ≈146 Oe V-1 . Two gating effects, the electrostatic doping and electrochemical reaction, are distinguished at various gating voltage regions, as confirmed by X-ray photoelectron spectroscopy and atomic force microscopy experiments. This work shows a unique ionic-liquid-gating system for strong interfacial magnetoelectric coupling with many practical advantages, paving the way toward ion-liquid-gating spintronic/electronic devices.
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Affiliation(s)
- Shishun Zhao
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Ziyao Zhou
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Bin Peng
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Mingmin Zhu
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Mengmeng Feng
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Qu Yang
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Yuan Yan
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Wei Ren
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Zuo-Guang Ye
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
- Department of Chemistry and 4D LABS, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada
| | - Yaohua Liu
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Ming Liu
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China
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42
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Okamoto S, Nichols J, Sohn C, Kim SY, Noh TW, Lee HN. Charge Transfer in Iridate-Manganite Superlattices. NANO LETTERS 2017; 17:2126-2130. [PMID: 28256840 DOI: 10.1021/acs.nanolett.6b04107] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Charge transfer in superlattices consisting of SrIrO3 and SrMnO3 is investigated using density functional theory. Despite the nearly identical work function and nonpolar interfaces between SrIrO3 and SrMnO3, rather large charge transfer was experimentally reported at the interface between them. Here, we report a microscopic model that captures the mechanism behind this phenomenon, providing a qualitative understanding of the experimental observation. This leads to unique strain dependence of such charge transfer in iridate-manganite superlattices. The predicted behavior is consistently verified by experiment with soft X-ray and optical spectroscopy. Our work thus demonstrates a new route to control electronic states in nonpolar oxide heterostructures.
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Affiliation(s)
- Satoshi Okamoto
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - John Nichols
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Changhee Sohn
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - So Yeun Kim
- Center for Correlated Electron Systems, Institute for Basic Science (IBS) , Seoul 08826, Republic of Korea
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea
| | - Tae Won Noh
- Center for Correlated Electron Systems, Institute for Basic Science (IBS) , Seoul 08826, Republic of Korea
- Department of Physics & Astronomy, Seoul National University , Seoul 08826, Republic of Korea
| | - Ho Nyung Lee
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
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43
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Wang F, Ren Z, Tian H, Yang SA, Xie Y, Lu Y, Jiang J, Han G, Yang K. Interfacial Multiferroics of TiO 2/PbTiO 3 Heterostructure Driven by Ferroelectric Polarization Discontinuity. ACS APPLIED MATERIALS & INTERFACES 2017; 9:1899-1906. [PMID: 27990804 DOI: 10.1021/acsami.6b13183] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Novel phenomena appear when two different oxide materials are combined together to form an interface. For example, at the interface of LaAlO3/SrTiO3, two-dimensional conductive states form to avoid the polar discontinuity, and magnetic properties are found at such an interface. In this work, we propose a new type of interface between two nonmagnetic and nonpolar oxides that could host a magnetic state, where it is the ferroelectric polarization discontinuity instead of the polar discontinuity that leads to the charge transfer, forming the interfacial magnetic state. As a concrete example, we investigate by first-principles calculations the heterostructures made of ferroelectric perovskite oxide PbTiO3 and nonferroelectric polarized oxide TiO2. We show that charge is transferred to the interfacial layer forming an interfacial ferromagnetic ordering that may persist up to room temperature. Especially, the strong coupling between bulk ferroelectric polarization and interface ferromagnetism represents a new type of magnetoelectric effect, which provides an ideal platform for exploring the intriguing interfacial multiferroics. The findings here are important not only for fundamental science but also for promising applications in nanoscale electronics and spintronics.
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Affiliation(s)
| | | | | | - Shengyuan A Yang
- Research Laboratory for Quantum Materials, Singapore University of Technology and Design , Singapore 487372, Singapore
| | | | | | | | | | - Kesong Yang
- Department of NanoEngineering, University of California , San Diego, 9500 Gilman Drive, Mail Code 0448, La Jolla, California 92093-0448, United States
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44
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Chen B, Chen P, Xu H, Jin F, Guo Z, Lan D, Wan S, Gao G, Chen F, Wu W. Interfacial Control of Ferromagnetism in Ultrathin La 0.67Ca 0.33MnO 3 Sandwiched between CaRu 1-xTi xO 3 (x = 0-0.8) Epilayers. ACS APPLIED MATERIALS & INTERFACES 2016; 8:34924-34932. [PMID: 27936558 DOI: 10.1021/acsami.6b13158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Controlling functionalities in oxide heterostructures remains challenging for the rather complex interfacial interactions. Here, by modifying the interface properties with chemical doping, we achieve a nontrivial control over the ferromagnetism in ultrathin La0.67Ca0.33MnO3 (LCMO) layer sandwiched between CaRu1-xTixO3 [CRTO(x)] epilayers. The Ti doping suppresses the interfacial electron transfer from CRTO(x) to LCMO side; as a result, a steadily decreased Curie temperature with increasing x, from 262 K at x = 0 to 186 K at x = 0.8, is observed for the structures with LCMO fixed at 3.2 nm. Moreover, for more insulating CRTO(x ≥ 0.5), the electron confinement induces an interfacial Mn-eg(x2-y2) orbital order in LCMO which further attenuates the ferromagnetism. Also, in order to characterize the heterointerfaces, for the first time the doping- and thickness-dependent metal-insulator transitions in CRTO(x) films are examined. Our results demonstrate that the LCMO/CRTO(x) heterostructure could be a model system for investigating the interfacial multiple interactions in correlated oxides.
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Affiliation(s)
- Binbin Chen
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China
| | - Pingfan Chen
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China
| | - Haoran Xu
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China
| | - Feng Jin
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China
| | - Zhuang Guo
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China
| | - Da Lan
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China
| | - Siyuan Wan
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China
| | - Guanyin Gao
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China
| | - Feng Chen
- High Magnetic Field Laboratory, Chinese Academy of Sciences , Hefei 230031, China
| | - Wenbin Wu
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei 230026, China
- High Magnetic Field Laboratory, Chinese Academy of Sciences , Hefei 230031, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
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Fabbris G, Meyers D, Okamoto J, Pelliciari J, Disa AS, Huang Y, Chen ZY, Wu WB, Chen CT, Ismail-Beigi S, Ahn CH, Walker FJ, Huang DJ, Schmitt T, Dean MPM. Orbital Engineering in Nickelate Heterostructures Driven by Anisotropic Oxygen Hybridization rather than Orbital Energy Levels. PHYSICAL REVIEW LETTERS 2016; 117:147401. [PMID: 27740843 DOI: 10.1103/physrevlett.117.147401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Indexed: 06/06/2023]
Abstract
Resonant inelastic x-ray scattering is used to investigate the electronic origin of orbital polarization in nickelate heterostructures taking LaTiO_{3}-LaNiO_{3}-3×(LaAlO_{3}), a system with exceptionally large polarization, as a model system. We find that heterostructuring generates only minor changes in the Ni 3d orbital energy levels, contradicting the often-invoked picture in which changes in orbital energy levels generate orbital polarization. Instead, O K-edge x-ray absorption spectroscopy demonstrates that orbital polarization is caused by an anisotropic reconstruction of the oxygen ligand hole states. This provides an explanation for the limited success of theoretical predictions based on tuning orbital energy levels and implies that future theories should focus on anisotropic hybridization as the most effective means to drive large changes in electronic structure and realize novel emergent phenomena.
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Affiliation(s)
- G Fabbris
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - D Meyers
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - J Okamoto
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - J Pelliciari
- Research Department "Synchrotron Radiation and Nanotechnology", Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - A S Disa
- Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA
| | - Y Huang
- Research Department "Synchrotron Radiation and Nanotechnology", Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Z-Y Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - W B Wu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - C T Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S Ismail-Beigi
- Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06520, USA
| | - C H Ahn
- Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06520, USA
| | - F J Walker
- Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA
| | - D J Huang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
- Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - T Schmitt
- Research Department "Synchrotron Radiation and Nanotechnology", Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - M P M Dean
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
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Superconductor to Mott insulator transition in YBa2Cu3O7/LaCaMnO3 heterostructures. Sci Rep 2016; 6:33184. [PMID: 27627855 PMCID: PMC5024130 DOI: 10.1038/srep33184] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 08/15/2016] [Indexed: 11/08/2022] Open
Abstract
The superconductor-to-insulator transition (SIT) induced by means such as external magnetic fields, disorder or spatial confinement is a vivid illustration of a quantum phase transition dramatically affecting the superconducting order parameter. In pursuit of a new realization of the SIT by interfacial charge transfer, we developed extremely thin superlattices composed of high Tc superconductor YBa2Cu3O7 (YBCO) and colossal magnetoresistance ferromagnet La0.67Ca0.33MnO3 (LCMO). By using linearly polarized resonant X-ray absorption spectroscopy and magnetic circular dichroism, combined with hard X-ray photoelectron spectroscopy, we derived a complete picture of the interfacial carrier doping in cuprate and manganite atomic layers, leading to the transition from superconducting to an unusual Mott insulating state emerging with the increase of LCMO layer thickness. In addition, contrary to the common perception that only transition metal ions may respond to the charge transfer process, we found that charge is also actively compensated by rare-earth and alkaline-earth metal ions of the interface. Such deterministic control of Tc by pure electronic doping without any hindering effects of chemical substitution is another promising route to disentangle the role of disorder on the pseudo-gap and charge density wave phases of underdoped cuprates.
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47
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Xu P, Ayino Y, Cheng C, Pribiag VS, Comes RB, Sushko PV, Chambers SA, Jalan B. Predictive Control over Charge Density in the Two-Dimensional Electron Gas at the Polar-Nonpolar NdTiO_{3}/SrTiO_{3} Interface. PHYSICAL REVIEW LETTERS 2016; 117:106803. [PMID: 27636487 DOI: 10.1103/physrevlett.117.106803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Indexed: 06/06/2023]
Abstract
Through systematic control of the Nd concentration, we show that the carrier density of the two-dimensional electron gas (2DEG) in SrTiO_{3}/NdTiO_{3}/SrTiO_{3}(001) can be modulated over a wide range. We also demonstrate that the NdTiO_{3} in heterojunctions without a SrTiO_{3} cap is degraded by oxygen absorption from air, resulting in the immobilization of donor electrons that could otherwise contribute to the 2DEG. This system is, thus, an ideal model to understand and control the insulator-to-metal transition in a 2DEG based on both environmental conditions and film-growth processing parameters.
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Affiliation(s)
- Peng Xu
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Yilikal Ayino
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Christopher Cheng
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Vlad S Pribiag
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Ryan B Comes
- Physical & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Peter V Sushko
- Physical & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Scott A Chambers
- Physical & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Bharat Jalan
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
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48
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Khandy SA, Gupta DC. Investigation of the transport, structural and mechanical properties of half-metallic REMnO3 (RE = Ce and Pr) ferromagnets. RSC Adv 2016. [DOI: 10.1039/c6ra19448f] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Systematic investigation of the ground state structure, elastic and transport properties, of perovskite oxides REMnO3 (RE = Ce and Pr) has been carried out by first principles calculations. The half-metallicity and ferromagnetism is well explained.
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Affiliation(s)
- Shakeel Ahmad Khandy
- Condensed Matter Theory Group
- School of Studies in Physics
- Jiwaji University
- Gwalior – 474 011
- India
| | - Dinesh C. Gupta
- Condensed Matter Theory Group
- School of Studies in Physics
- Jiwaji University
- Gwalior – 474 011
- India
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