1
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Yang C, Pons R, Sigle W, Wang H, Benckiser E, Logvenov G, Keimer B, van Aken PA. Direct observation of strong surface reconstruction in partially reduced nickelate films. Nat Commun 2024; 15:378. [PMID: 38191551 PMCID: PMC10774438 DOI: 10.1038/s41467-023-44616-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 12/22/2023] [Indexed: 01/10/2024] Open
Abstract
The polarity of a surface can affect the electronic and structural properties of oxide thin films through electrostatic effects. Understanding the mechanism behind these effects requires knowledge of the atomic structure and electrostatic characteristics at the surface. In this study, we use annular bright-field imaging to investigate the surface structure of a Pr0.8Sr0.2NiO2+x (0 < x < 1) film. We observe a polar distortion coupled with octahedral rotations in a fully oxidized Pr0.8Sr0.2NiO3 sample, and a stronger polar distortion in a partially reduced sample. Its spatial depth extent is about three unit cells from the surface. Additionally, we use four-dimensional scanning transmission electron microscopy (4D-STEM) to directly image the local atomic electric field surrounding Ni atoms near the surface and discover distinct valence variations of Ni atoms, which are confirmed by atomic-resolution electron energy-loss spectroscopy (EELS). Our results suggest that the strong surface reconstruction in the reduced sample is closely related to the formation of oxygen vacancies from topochemical reduction. These findings provide insights into the understanding and evolution of surface polarity at the atomic level.
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Affiliation(s)
- Chao Yang
- Max Planck Institute for Solid State Research, Stuttgart, Germany.
| | - Rebecca Pons
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Wilfried Sigle
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Hongguang Wang
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Eva Benckiser
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Gennady Logvenov
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Bernhard Keimer
- Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Peter A van Aken
- Max Planck Institute for Solid State Research, Stuttgart, Germany
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2
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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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3
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Kim JW, Choi Y, Middey S, Meyers D, Chakhalian J, Shafer P, Park H, Ryan PJ. Direct Evidence of the Competing Nature between Electronic and Lattice Breathing Order in Rare-Earth Nickelates. PHYSICAL REVIEW LETTERS 2020; 124:127601. [PMID: 32281874 DOI: 10.1103/physrevlett.124.127601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 02/06/2020] [Indexed: 06/11/2023]
Abstract
Correlated electrons give rise to both exotic electronic and magnetic properties in rare-earth nickelates. Here we present evidence of the interfacial coupling between two nickelate systems, EuNiO_{3} (ENO) and LaNiO_{3} (LNO), with different electronic and magnetic properties but with compatible structural registry giving rise to an electrostructural transition, unobserved in each constituent. Nominally, LNO remains in a paramagnetic-metallic R3[over ¯]c phase while orthorhombic ENO undergoes antiferromagnetic and insulating transitions. However, the ENO/LNO heterostructure displays a uniform rotational symmetry set by an entwined interface. This leads to an anomalous reduction of bond disproportionation in the ENO layer through the metal to insulator transition and concomitantly charge disproportionation opens the gap accompanied by antiferromagnetic ordering. Our results resolve a long-standing question in the physics of rare-earth nickelates, herein demonstrating that charge and bond disproportionation are competing mechanisms for the charge localization process in the rare-earth nickelate system.
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Affiliation(s)
- Jong-Woo Kim
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Yongseong Choi
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Middey
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | - D Meyers
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - J Chakhalian
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Padraic Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - H Park
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Philip J Ryan
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
- School of Physical Sciences, Dublin City University, Dublin 11, Ireland
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4
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Nishikubo T, Sakai Y, Oka K, Watanuki T, Machida A, Mizumaki M, Maebayashi K, Imai T, Ogata T, Yokoyama K, Okimoto Y, Koshihara SY, Hojo H, Mizokawa T, Azuma M. Enhanced Negative Thermal Expansion Induced by Simultaneous Charge Transfer and Polar–Nonpolar Transitions. J Am Chem Soc 2019; 141:19397-19403. [DOI: 10.1021/jacs.9b10336] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Takumi Nishikubo
- Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Yuki Sakai
- Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
- Kanagawa Institute of Industrial Science and Technology, 705-1 Shimoimaizumi, Ebina, Kanagawa 243-0435, Japan
| | - Kengo Oka
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashiosaka, Osaka 577-8502, Japan
| | - Tetsu Watanuki
- Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Akihiko Machida
- Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Masaichiro Mizumaki
- Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Koki Maebayashi
- Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Takashi Imai
- Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Takahiro Ogata
- Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Keisuke Yokoyama
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
| | - Yoichi Okimoto
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
| | - Shin-ya Koshihara
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
| | - Hajime Hojo
- Department of Advanced Materials Science and Engineering, Faculty of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
| | - Takashi Mizokawa
- Department of Applied Physics, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Masaki Azuma
- Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
- Kanagawa Institute of Industrial Science and Technology, 705-1 Shimoimaizumi, Ebina, Kanagawa 243-0435, Japan
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5
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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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6
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Balasubramanian P, Joshi SR, Yadav R, de Groot FMF, Singh AK, Ray A, Gupta M, Singh A, Maurya S, Elizabeth S, Varma S, Maitra T, Malik V. Electronic structure of Pr 2MnNiO 6 from x-ray photoemission, absorption and density functional theory. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:435603. [PMID: 30215386 DOI: 10.1088/1361-648x/aae168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The electronic structure of double perovskite Pr2MnNiO6 was studied using core x-ray photoelectron spectroscopy and x-ray absorption spectroscopy. The 2p x-ray absorption spectra show that Mn and Ni are in 4+ and 2+ states respectively. Based on charge transfer multiplet analysis of the 2p XPS spectra of both ions, we find charge transfer energies [Formula: see text] of 3.5 and 2.5 eV for Ni and Mn respectively. The ground state of Ni2+ and Mn4+ ions reveal a higher d electron count of 8.21 and 3.38 respectively as compared to the ionic values. The partial density of states clearly show a charge transfer character of the system for U - J [Formula: see text] 2 eV. The O 1s edge absorption spectra reveal a band gap of 0.9 eV, which is close to the value estimated from analysis of Ni and Mn 2p photoemission and absorption spectra. The combined analysis of nature of spectroscopic data and first principles calculations reveal that the material is a p - d type charge transfer insulator with an intermediate covalent character according to the Zannen-Sawatzy-Allen phase diagram.
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Affiliation(s)
- Padmanabhan Balasubramanian
- Department of Physics, Indian Institute of technology, Roorkee-247667, Uttarakhand, India. Institute of Physics, Bhubaneshwar-750012, India
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7
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Singh AK, Balasubramanian P, Singh A, Gupta MK, Chandra R. Structural transformation, Griffiths phase and metal-insulator transition in polycrystalline Nd 2-x Sr x NiMnO 6 (x = 0, 0.2, 0.4, 0.5 and 1) compound. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:355401. [PMID: 30039807 DOI: 10.1088/1361-648x/aad573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Polycrystalline double perovskite Nd2-x Sr x NiMnO6 (x = 0, 0.2, 0.4, 0.5 and 1) samples were synthesized using the solid state reaction method. There occurs a structural transformation from monoclinic (P21/n, for x = 0 to x = 0.5) to cubic (Fm [Formula: see text] m, for x = 1) with increasing Sr doping. Raman spectroscopy reveals the increase in static disorder with doping. The Curie temperature (T C) shows a small increase from x = 0 to 0.5 (T C ~ 200 K), but for x = 1, T C increases drastically upto ~264 K. The deviation of 1/χ(T) from Curie-Weiss behaviour for doped samples with exponent less than one, indicates a development of the Griffiths phase with doping. The systematic reduction in magnetic moment at 5 K suggests an increase in anti-site disorders with doping. Mn 3s x-ray photoemission spectra show an increase in exchange splitting, indicating a decrease in the valency of Mn. The x-ray absorption spectra at Ni and Mn 2p edges show that the formal valence remains 2+ (Ni) and 4+ (Mn) for all the samples, with changes in spectral weights. Ni 2p x-ray photoemission spectra show characteristic feature similar to Ni3+ systems, only for x = 1 sample. Our GGA-based calculations for the ordered supercell, predict half metallic character for doping (x > 0) samples due to delocalization of Ni eg orbitals. The calculations with anti-site disorders yield drastic reduction in Ni moments, with the disordered anti-ferromagnetic phase having lowest energy at maximum doping. Temperature dependent resistivity measurements exhibit a clear metallic region for x = 0.2 sample, while for higher dopings (x > 0.2), the metallicity gets suppressed due to increase in anti-site disorders in these samples.
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Affiliation(s)
- Amit Kumar Singh
- Institute Instrumentation Centre, Indian Institute of Technology, Roorkee-247667, India. Department of Physics, Marwari college, Darbhanga 846004, Bihar, India
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8
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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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9
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Volume-wise destruction of the antiferromagnetic Mott insulating state through quantum tuning. Nat Commun 2016; 7:12519. [PMID: 27531192 PMCID: PMC4992057 DOI: 10.1038/ncomms12519] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 07/11/2016] [Indexed: 11/08/2022] Open
Abstract
RENiO3 (RE=rare-earth element) and V2O3 are archetypal Mott insulator systems. When tuned by chemical substitution (RENiO3) or pressure (V2O3), they exhibit a quantum phase transition (QPT) between an antiferromagnetic Mott insulating state and a paramagnetic metallic state. Because novel physics often appears near a Mott QPT, the details of this transition, such as whether it is first or second order, are important. Here, we demonstrate through muon spin relaxation/rotation (μSR) experiments that the QPT in RENiO3 and V2O3 is first order: the magnetically ordered volume fraction decreases to zero at the QPT, resulting in a broad region of intrinsic phase separation, while the ordered magnetic moment retains its full value until it is suddenly destroyed at the QPT. These findings bring to light a surprising universality of the pressure-driven Mott transition, revealing the importance of phase separation and calling for further investigation into the nature of quantum fluctuations underlying the transition.
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10
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Mir SA, Ikram M, Asokan K. Investigating spin reversal and other anomalies in magnetic, transport and specific heat measurements of NdFeO3 and NdFe0.5Ni0.5O3 ortho-perovskites. RSC Adv 2015. [DOI: 10.1039/c5ra17045a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Specific heat versus temperature. Lower inset: zero-field data with the fitting result. Upper inset: specific heat versus temperature at different magnetic fields near a Schottky anomaly in (a) NFO and (b) NFNO.
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Affiliation(s)
- Sajad A. Mir
- Solid State Physics Lab
- Department of Physics
- National Institute of Technology Hazratbal Srinagar (J & K)-190006
- India
| | - M. Ikram
- Solid State Physics Lab
- Department of Physics
- National Institute of Technology Hazratbal Srinagar (J & K)-190006
- India
| | - K. Asokan
- Materials Science Division
- Inter University Accelerator Centre
- New Delhi-110067
- India
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11
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Wang HL, Ning XK, Wang ZJ. Enhanced electrical conductivity of Au–LaNiO3 nanocomposite thin films by chemical solution deposition. RSC Adv 2015. [DOI: 10.1039/c5ra15152j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Au–LaNiO3 (Au–LNO) nanocomposite films with 3.84 at% Au were firstly fabricated by one-step chemical solution deposition (CSD), and their electrical properties were investigated.
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Affiliation(s)
- H. L. Wang
- Shenyang National Laboratory for Materials Science
- Institute of Metal Research (IMR)
- Chinese Academy of Sciences (CAS)
- Shenyang 110016
- China
| | - X. K. Ning
- Shenyang National Laboratory for Materials Science
- Institute of Metal Research (IMR)
- Chinese Academy of Sciences (CAS)
- Shenyang 110016
- China
| | - Z. J. Wang
- Shenyang National Laboratory for Materials Science
- Institute of Metal Research (IMR)
- Chinese Academy of Sciences (CAS)
- Shenyang 110016
- China
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12
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Cammarata A, Rondinelli JM. Covalent dependence of octahedral rotations in orthorhombic perovskite oxides. J Chem Phys 2014; 141:114704. [DOI: 10.1063/1.4895967] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Antonio Cammarata
- Department of Control Engineering, Czech Technical University, Prague, 121 35 Prague 2, Czech Republic
| | - James M. Rondinelli
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
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13
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Kumah DP, Disa AS, Ngai JH, Chen H, Malashevich A, Reiner JW, Ismail-Beigi S, Walker FJ, Ahn CH. Tuning the structure of nickelates to achieve two-dimensional electron conduction. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:1935-1940. [PMID: 24497382 DOI: 10.1002/adma.201304256] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 01/09/2014] [Indexed: 06/03/2023]
Abstract
Metallic electronic transport in nickelate heterostructures can be induced and confined to two dimensions (2D) by controlling the structural parameters of the nickel-oxygen planes.
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Affiliation(s)
- Divine P Kumah
- Center for Research on Interface Structures and Phenomena, Department of Applied Physics, Yale University, New Haven, Connecticut, 06520, USA
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14
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Gupta M, Kotnala R, Khan W, Azam A, Naqvi A. Magnetic, transport and magnetoresistance behavior of Ni doped La0.67Sr0.33Mn1−Ni O3 (0.00≤x≤0.09) system. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.05.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Peng HY, Li YF, Lin WN, Wang YZ, Gao XY, Wu T. Deterministic conversion between memory and threshold resistive switching via tuning the strong electron correlation. Sci Rep 2012; 2:442. [PMID: 22679556 PMCID: PMC3369197 DOI: 10.1038/srep00442] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 04/30/2012] [Indexed: 11/08/2022] Open
Abstract
Intensive investigations have been launched worldwide on the resistive switching (RS) phenomena in transition metal oxides due to both fascinating science and potential applications in next generation nonvolatile resistive random access memory (RRAM) devices. It is noteworthy that most of these oxides are strongly correlated electron systems, and their electronic properties are critically affected by the electron-electron interactions. Here, using NiO as an example, we show that rationally adjusting the stoichiometry and the associated defect characteristics enables controlled room temperature conversions between two distinct RS modes, i.e., nonvolatile memory switching and volatile threshold switching, within a single device. Moreover, from first-principles calculations and x-ray absorption spectroscopy studies, we found that the strong electron correlations and the exchange interactions between Ni and O orbitals play deterministic roles in the RS operations.
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Affiliation(s)
- Hai Yang Peng
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Yong Feng Li
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Wei Nan Lin
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Yu Zhan Wang
- Physics Department, National University of Singapore, 2 Science Drive 3, 117542 Singapore
| | - Xing Yu Gao
- Physics Department, National University of Singapore, 2 Science Drive 3, 117542 Singapore
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 239 Zhang Heng Road, Pudong New District, Shanghai, 201203 P. R. China
| | - Tom Wu
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
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Sarma DD, Shanthi N, Krishnakumar SR, Saitoh T, Mizokawa T, Sekiyama A, Kobayashi K, Fujimori A, Weschke E, Meier R, Kaindl G, Takeda Y, Takano M. Temperature-dependent photoemission spectral weight in La0.6Sr0.4MnO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:6873-6876. [PMID: 9982110 DOI: 10.1103/physrevb.53.6873] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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