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Liu YB, Mei JW, Ye F, Chen WQ, Yang F. s^{±}-Wave Pairing and the Destructive Role of Apical-Oxygen Deficiencies in La_{3}Ni_{2}O_{7} under Pressure. Phys Rev Lett 2023; 131:236002. [PMID: 38134785 DOI: 10.1103/physrevlett.131.236002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 10/20/2023] [Accepted: 11/02/2023] [Indexed: 12/24/2023]
Abstract
Recently, the bilayer perovskite nickelate La_{3}Ni_{2}O_{7} has been reported to show evidence of high-temperature superconductivity (SC) under a moderate pressure of about 14 GPa. To investigate the superconducting mechanism, pairing symmetry, and the role of apical-oxygen deficiencies in this material, we perform a random-phase approximation based study on a bilayer model consisting of the d_{x^{2}-y^{2}} and d_{3z^{2}-r^{2}} orbitals of Ni atoms in both the pristine crystal and the crystal with apical-oxygen deficiencies. Our analysis reveals an s^{±}-wave pairing symmetry driven by spin fluctuations. The crucial role of pressure lies in that it induces the emergence of the γ pocket, which is involved in the strongest Fermi-surface nesting. We further found the emergence of local moments in the vicinity of apical-oxygen deficiencies, which significantly suppresses the T_{c}. Therefore, it is possible to significantly enhance the T_{c} by eliminating oxygen deficiencies during the synthesis of the samples.
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Affiliation(s)
- Yu-Bo Liu
- School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Jia-Wei Mei
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
| | - Fei Ye
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
| | - Wei-Qiang Chen
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
| | - Fan Yang
- School of Physics, Beijing Institute of Technology, Beijing 100081, China
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2
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Shen JY, Shi CY, Pan ZM, Ju LL, Dong MD, Chen GF, Zhang YC, Yuan JK, Wu CJ, Xie YW, Wu J. Reentrance of interface superconductivity in a high-T c cuprate heterostructure. Nat Commun 2023; 14:7290. [PMID: 37949854 PMCID: PMC10638369 DOI: 10.1038/s41467-023-42903-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Accepted: 10/25/2023] [Indexed: 11/12/2023] Open
Abstract
Increasing the carrier density in a Mott insulator by chemical doping gives rise to a generic superconducting dome in high temperature superconductors. An intriguing question is whether a second superconducting dome may exist at higher dopings. Here we heavily overdope La2-xSrxCuO4 (0.45 ≤ x ≤ 1.0) and discover an unprecedented reentrance of interface superconductivity in La2-xSrxCuO4 /La2CuO4 heterostructures. As x increases, the superconductivity is weakened and completely fades away at x = 0.8; but it revives at higher doping and fully recovers at x = 1.0. This is shown to be correlated with the suppression of the interfacial charge transfer around x = 0.8 and the weak-to-strong localization crossover in the La2-xSrxCuO4 layer. We further construct a theoretical model to account for the sophisticated relation between charge localization and interfacial charge transfer. Our work advances both the search for and control of new superconducting heterostructures.
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Affiliation(s)
- J Y Shen
- School of Physics, Zhejiang University, Hangzhou, 310027, China
- Research Center for Industries of the Future, Westlake University, Hangzhou, 310024, China
- Department of Physics, School of Science, Westlake University, Hangzhou, 310024, China
- Key Laboratory for Quantum Materials of Zhejiang Province, School of Science, Westlake University, Hangzhou, 310024, China
| | - C Y Shi
- School of Physics, Zhejiang University, Hangzhou, 310027, China
| | - Z M Pan
- Department of Physics, School of Science, Westlake University, Hangzhou, 310024, China
| | - L L Ju
- School of Physics, Zhejiang University, Hangzhou, 310027, China
| | - M D Dong
- School of Physics, Zhejiang University, Hangzhou, 310027, China
- Research Center for Industries of the Future, Westlake University, Hangzhou, 310024, China
- Department of Physics, School of Science, Westlake University, Hangzhou, 310024, China
- Key Laboratory for Quantum Materials of Zhejiang Province, School of Science, Westlake University, Hangzhou, 310024, China
| | - G F Chen
- School of Physics, Zhejiang University, Hangzhou, 310027, China
- Research Center for Industries of the Future, Westlake University, Hangzhou, 310024, China
- Department of Physics, School of Science, Westlake University, Hangzhou, 310024, China
- Key Laboratory for Quantum Materials of Zhejiang Province, School of Science, Westlake University, Hangzhou, 310024, China
| | - Y C Zhang
- School of Physics, Zhejiang University, Hangzhou, 310027, China
- Research Center for Industries of the Future, Westlake University, Hangzhou, 310024, China
- Department of Physics, School of Science, Westlake University, Hangzhou, 310024, China
- Key Laboratory for Quantum Materials of Zhejiang Province, School of Science, Westlake University, Hangzhou, 310024, China
| | - J K Yuan
- Department of Physics, School of Science, Westlake University, Hangzhou, 310024, China
| | - C J Wu
- Department of Physics, School of Science, Westlake University, Hangzhou, 310024, China
- Key Laboratory for Quantum Materials of Zhejiang Province, School of Science, Westlake University, Hangzhou, 310024, China
- New Cornerstone Science Laboratory, Department of Physics, School of Science, Westlake University, 310024, Hangzhou, China
- Institute for Theoretical Sciences, Westlake University, Hangzhou, 310024, Zhejiang, China
- Institute of Natural Sciences, Westlake Institute for Advanced Study, Hangzhou, 310024, Zhejiang, China
| | - Y W Xie
- School of Physics, Zhejiang University, Hangzhou, 310027, China
| | - J Wu
- Research Center for Industries of the Future, Westlake University, Hangzhou, 310024, China.
- Department of Physics, School of Science, Westlake University, Hangzhou, 310024, China.
- Key Laboratory for Quantum Materials of Zhejiang Province, School of Science, Westlake University, Hangzhou, 310024, China.
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3
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Luo Z, Hu X, Wang M, Wú W, Yao DX. Bilayer Two-Orbital Model of La_{3}Ni_{2}O_{7} under Pressure. Phys Rev Lett 2023; 131:126001. [PMID: 37802931 DOI: 10.1103/physrevlett.131.126001] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 07/16/2023] [Accepted: 08/23/2023] [Indexed: 10/08/2023]
Abstract
The newly discovered Ruddlesden-Popper bilayer La_{3}Ni_{2}O_{7} reaches a remarkable superconducting transition temperature T_{c}≈80 K under a pressure of above 14 GPa. Here we propose a minimal bilayer two-orbital model of the high-pressure phase of La_{3}Ni_{2}O_{7}. Our model is constructed with the Ni-3d_{x^{2}-y^{2}}, 3d_{3z^{2}-r^{2}} orbitals by using Wannier downfolding of the density functional theory calculations, which captures the key ingredients of the material, such as band structure and Fermi surface topology. There are two electron pockets, α, β, and one hole pocket, γ, on the Fermi surface, in which the α, β pockets show mixing of two orbitals, while the γ pocket is associated with Ni-d_{3z^{2}-r^{2}} orbital. The random phase approximation spin susceptibility reveals a magnetic enhancement associated with the d_{3z^{2}-r^{2}} state. A higher energy model with O-p orbitals is also provided for further study.
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Affiliation(s)
- Zhihui Luo
- Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Xunwu Hu
- Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Meng Wang
- Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Wéi Wú
- Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Dao-Xin Yao
- Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, 510275, China
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4
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Silkin VM, Drechsler SL, Efremov DV. Unusual Low-Energy Collective Charge Excitations in High- Tc Cuprate Superconductors. J Phys Chem Lett 2023; 14:8060-8068. [PMID: 37655950 PMCID: PMC10510710 DOI: 10.1021/acs.jpclett.3c01871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Accepted: 08/14/2023] [Indexed: 09/02/2023]
Abstract
Despite decades of intensive experimental and theoretical efforts, the physics of cuprate high-temperature superconductors in general, and, in particular, their normal state, is still under debate. Here, we report our investigation of low-energy charge excitations in the normal state. We find that the peculiarities of the electronic band structure at low energies have a profound impact on the nature of the intraband collective modes. It gives rise to a new kind of mode with huge intensity and non-Lorentzian spectral function in addition to well-known collective excitations like conventional plasmons and spin fluctuation. We predict two such modes with maximal spectral weight in the nodal and antinodal directions. Additionally, we found a long-living quasi-one-dimensional plasmon becoming an intense soft mode over an extended momentum range along the antinodal direction. These modes might explain some of the resonant inelastic X-ray scattering spectroscopy data.
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Affiliation(s)
- Vyacheslav M. Silkin
- Donostia
International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain
- Departamento
de Polímeros y Materiales Avanzados: Física,
Química y Tecnología, Facultad de Ciencias
Químicas, Universidad del País
Vasco UPV/EHU, 20080 San Sebastián/Donostia, Basque Country, Spain
- IKERBASQUE,
Basque Foundation for Science, 48013 Bilbao, Basque Country, Spain
| | - Stefan-Ludwig Drechsler
- Leibniz
Institute for Solid State and Materials Research IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - Dmitry V. Efremov
- Leibniz
Institute for Solid State and Materials Research IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
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5
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Lynnyk A, Puzniak R, Shi L, Zhao J, Jin C. Superconducting State Properties of CuBa 2Ca 3Cu 4O 10+δ. Materials (Basel) 2023; 16:5111. [PMID: 37512384 PMCID: PMC10383888 DOI: 10.3390/ma16145111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Revised: 07/12/2023] [Accepted: 07/18/2023] [Indexed: 07/30/2023]
Abstract
The superconducting state properties of the CuBa2Ca3Cu4O10+δ (Cu-1234) system, with a transition temperature as high as 117.5 K, were investigated. The ac magnetic susceptibility measurements confirmed a very sharp transition to the superconducting state. The upper critical field, Hc2, as high as 91 T, and the irreversibility field, Hirr, as high as 21 T at 77 K, were determined using dc SQUID magnetization measurements. The intragrain critical current density, jc, estimated from a magnetic hysteresis loop, is as high as 5 × 109 A/m2 in a self-generated magnetic field at 77 K. However, the intergrain critical current density in the studied material is smaller by four orders of magnitude due to very weak intergrain connections.
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Affiliation(s)
- Artem Lynnyk
- Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, PL-02668 Warsaw, Poland
| | - Roman Puzniak
- Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, PL-02668 Warsaw, Poland
| | - Luchuan Shi
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Jianfa Zhao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Changqing Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan 523808, China
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6
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Ma Z, Wan T, Zhang D, Yuwono JA, Tsounis C, Jiang J, Chou YH, Lu X, Kumar PV, Ng YH, Chu D, Toe CY, Han Z, Amal R. Atomically Dispersed Cu Catalysts on Sulfide-Derived Defective Ag Nanowires for Electrochemical CO 2 Reduction. ACS Nano 2023; 17:2387-2398. [PMID: 36727675 DOI: 10.1021/acsnano.2c09473] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Single-atom catalysts (SACs) have shown potential for achieving an efficient electrochemical CO2 reduction reaction (CO2RR) despite challenges in their synthesis. Here, Ag2S/Ag nanowires provide initial anchoring sites for Cu SACs (Cu/Ag2S/Ag), then Cu/Ag(S) was synthesized by an electrochemical treatment resulting in complete sulfur removal, i.e., Cu SACs on a defective Ag surface. The CO2RR Faradaic efficiency (FECO2RR) of Cu/Ag(S) reaches 93.0% at a CO2RR partial current density (jCO2RR) of 2.9 mA/cm2 under -1.0 V vs RHE, which outperforms sulfur-removed Ag2S/Ag without Cu SACs (Ag(S), 78.5% FECO2RR with 1.8 mA/cm2jCO2RR). At -1.4 V vs RHE, both FECO2RR and jCO2RR over Cu/Ag(S) reached 78.6% and 6.1 mA/cm2, which tripled those over Ag(S), respectively. As revealed by in situ and ex situ characterizations together with theoretical calculations, the interacted Cu SACs and their neighboring defective Ag surface increase microstrain and downshift the d-band center of Cu/Ag(S), thus lowering the energy barrier by ∼0.5 eV for *CO formation, which accounts for the improved CO2RR activity and selectivity toward related products such as CO and C2+ products.
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Affiliation(s)
| | | | | | - Jodie A Yuwono
- College of Engineering and Computer Science, Australian National University, Canberra, Australian Capital Territory2601, Australia
| | | | | | | | | | | | - Yun Hau Ng
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, 999077, China
| | | | - Cui Ying Toe
- School of Engineering, The University of Newcastle, Callaghan, New South Wales2038, Australia
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7
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Peng CK, Lin YC, Chiang C, Qian Z, Huang YC, Dong CL, Li J, Chen CT, Hu Z, Chen SY, Lin YG. Zhang-Rice singlets state formed by two-step oxidation for triggering water oxidation under operando conditions. Nat Commun 2023; 14:529. [PMID: 36725864 PMCID: PMC9892518 DOI: 10.1038/s41467-023-36317-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 01/24/2023] [Indexed: 02/03/2023] Open
Abstract
The production of ecologically compatible fuels by electrochemical water splitting is highly desirable for modern industry. The Zhang-Rice singlet is well known for the superconductivity of high-temperature superconductors cuprate, but is rarely known for an electrochemical catalyst. Herein, we observe two steps of surface reconstruction from initial catalytic inactive Cu1+ in hydrogen treated Cu2O to Cu2+ state and further to catalytic active Zhang-Rice singlet state during the oxygen evolution reaction for water splitting. The hydrogen treated Cu2O catalyst exhibits a superior catalytic activity and stability for water splitting and is an efficient rival of other 3d-transition-metal catalysts. Multiple operando spectroscopies indicate that Zhang-Rice singlet is real active species, since it appears only under oxygen evolution reaction condition. This work provides an insight in developing an electrochemical catalyst from catalytically inactive materials and improves understanding of the mechanism of a Cu-based catalyst for water oxidation.
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Affiliation(s)
- Chun-Kuo Peng
- grid.260539.b0000 0001 2059 7017Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30010 Taiwan
| | - Yu-Chang Lin
- grid.260539.b0000 0001 2059 7017Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30010 Taiwan ,grid.410766.20000 0001 0749 1496National Synchrotron Radiation Research Center, Hsinchu, 30076 Taiwan
| | - Chao‐Lung Chiang
- grid.410766.20000 0001 0749 1496National Synchrotron Radiation Research Center, Hsinchu, 30076 Taiwan
| | - Zhengxin Qian
- grid.12955.3a0000 0001 2264 7233State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, 361005 Xiamen, China
| | - Yu-Cheng Huang
- grid.264580.d0000 0004 1937 1055Department of Physics, Tamkang University, New Taipei City, 25137 Taiwan
| | - Chung-Li Dong
- grid.264580.d0000 0004 1937 1055Department of Physics, Tamkang University, New Taipei City, 25137 Taiwan
| | - Jian‐Feng Li
- grid.12955.3a0000 0001 2264 7233State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, 361005 Xiamen, China
| | - Chien-Te Chen
- grid.410766.20000 0001 0749 1496National Synchrotron Radiation Research Center, Hsinchu, 30076 Taiwan
| | - Zhiwei Hu
- grid.419507.e0000 0004 0491 351XMax-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, 01187 Germany
| | - San-Yuan Chen
- grid.260539.b0000 0001 2059 7017Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30010 Taiwan
| | - Yan-Gu Lin
- grid.410766.20000 0001 0749 1496National Synchrotron Radiation Research Center, Hsinchu, 30076 Taiwan
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8
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Helal MA, Kojima S. Brillouin Scattering and First-Principles Studies of BaMO 3 (M = Ti, Zr, and Cu) Perovskites. Materials (Basel) 2022; 15:6747. [PMID: 36234088 PMCID: PMC9573334 DOI: 10.3390/ma15196747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 09/10/2022] [Accepted: 09/22/2022] [Indexed: 06/16/2023]
Abstract
Perovskite oxides with the general formula ABO3 comprise a large number of families among the structures of oxide-based materials, and currently, several perovskite structures have been identified. From a variety of compositions and structures, various functions are observed in perovskite compounds, and therefore, they became very useful for various applications in the electronic and medical industries. One of the most puzzling issues for perovskite compounds is the understanding of the vibration and relaxation dynamics in the gigahertz range. In that sense, the micro-Brillouin scattering system is a very effective tool to probe the gigahertz dynamics, and also, first-principles calculations can be used to describe the phonon structure with different atomic contributions. The micro-Brillouin scattering system and first-principles calculations provide the fundamental information on a variety of vibration and relaxation processes related to structural phase transitions under different external conditions such as temperature, electric field, and pressure. This review article summarizes the Brillouin scattering and first-principles studies on BaMO3 (M = Ti, Zr, and Cu). Through a detailed analysis of the existing results, we summarize the existing limitations and future perspectives in these research areas, which may propel the development of different perovskite ferroelectrics and extend their practical application areas.
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Affiliation(s)
- Md Al Helal
- Department of Physics, Begum Rokeya University, Rangpur 5400, Bangladesh
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8573, Japan
| | - Seiji Kojima
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8573, Japan
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Hanf S, Lizandara-pueyo C, Emmert TP, Jevtovikj I, Gläser R, Schunk SA. Synthetic Routes to Crystalline Complex Metal Alkyl Carbonates and Hydroxycarbonates via Sol–Gel Chemistry—Perspectives for Advanced Materials in Catalysis. Catalysts 2022; 12:554. [DOI: 10.3390/catal12050554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Metal alkoxides are easily available and versatile precursors for functional materials, such as solid catalysts. However, the poor solubility of metal alkoxides in organic solvents usually hinders their facile application in sol–gel processes and complicates access to complex carbonate or oxidic compounds after hydrolysis of the precursors. In our contribution we have therefore shown three different solubilization strategies for metal alkoxides, namely the derivatization, the hetero-metallization and CO2 insertion. The latter strategy leads to a stoichiometric insertion of CO2 into the metal–oxygen bond of the alkoxide and the subsequent formation of metal alkyl carbonates. These precursors can then be employed advantageously in sol–gel chemistry and, after controlled hydrolysis, result in chemically defined crystalline carbonates and hydroxycarbonates. Cu- and Zn-containing carbonates and hydroxycarbonates were used in an exemplary study for the synthesis of Cu/Zn-based bulk catalysts for methanol synthesis with a final comparable catalytic activity to commercial standard reference catalysts.
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10
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Yang G, El Loubani M, Hill D, Lee D. Control of crystallographic orientation in Ruddlesden-Popper for fast oxygen reduction. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.04.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
The recent discovery of the superconductivity in the doped infinite layer nickelatesRNiO2(R= La, Pr, Nd) is of great interest since the nickelates are isostructural to doped (Ca, Sr)CuO2having superconducting transition temperature (Tc) of about 110 K. Verifying the commonalities and differences between these oxides will certainly give a new insight into the mechanism of highTcsuperconductivity in correlated electron systems. In this paper, we review experimental and theoretical works on this new superconductor and discuss the future perspectives for the 'nickel age' of superconductivity.
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Affiliation(s)
- Yusuke Nomura
- RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Ryotaro Arita
- RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Applied Physics, University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656, Japan
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Kanao E, Nakano K, Kamei R, Hosomi T, Ishihama Y, Adachi J, Kubo T, Otsuka K, Yanagida T. Moderate molecular recognitions on ZnO m-plane and their selective capture/release of bio-related phosphoric acids. Nanoscale Adv 2022; 4:1649-1658. [PMID: 36134362 PMCID: PMC9417451 DOI: 10.1039/d1na00865j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 02/16/2022] [Indexed: 05/25/2023]
Abstract
Herein, we explore the hidden molecular recognition abilities of ZnO nanowires uniformly grown on the inner surface of an open tubular fused silica capillary via liquid chromatography. Chromatographic evaluation revealed that ZnO nanowires showed a stronger intermolecular interaction with phenylphosphoric acid than any other monosubstituted benzene. Furthermore, ZnO nanowires specifically recognized the phosphate groups present in nucleotides even in the aqueous mobile phase, and the intermolecular interaction increased with the number of phosphate groups. This discrimination of phosphate groups in nucleotides was unique to the rich (101̄0) m-plane of ZnO nanowires with a moderate hydrophilicity and negative charge. The discrimination could be evidenced by the changes in the infrared bands of the phosphate groups on nucleotides on ZnO nanowires. Finally, as an application of the molecular recognition, nucleotides were separated by the number of phosphate groups, utilizing optimized gradient elution on ZnO nanowire column. Thus, the present results elucidate the unique and versatile molecular selectivity of well-known ZnO nanostructures for the capture and separation of biomolecules.
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Affiliation(s)
- Eisuke Kanao
- Graduate School of Pharmaceutical Sciences, Kyoto University Sakyo-ku Kyoto 606-8501 Japan +81-75-753-4601 +81-75-753-4565
- National Institutes of Bio Medical Innovation, Health and Nutrition Ibaraki Osaka 567-0085 Japan
| | - Katsuya Nakano
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku Kyoto 615-8510 Japan +81-75-383-2450 +81-75-383-2448
| | - Ryoma Kamei
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8654 Japan
| | - Takuro Hosomi
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8654 Japan
- Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST) 4-1-8 Honcho, Kawaguchi Saitama 332-0012 Japan
| | - Yasushi Ishihama
- Graduate School of Pharmaceutical Sciences, Kyoto University Sakyo-ku Kyoto 606-8501 Japan +81-75-753-4601 +81-75-753-4565
- National Institutes of Bio Medical Innovation, Health and Nutrition Ibaraki Osaka 567-0085 Japan
| | - Jun Adachi
- Graduate School of Pharmaceutical Sciences, Kyoto University Sakyo-ku Kyoto 606-8501 Japan +81-75-753-4601 +81-75-753-4565
- National Institutes of Bio Medical Innovation, Health and Nutrition Ibaraki Osaka 567-0085 Japan
| | - Takuya Kubo
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku Kyoto 615-8510 Japan +81-75-383-2450 +81-75-383-2448
| | - Koji Otsuka
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku Kyoto 615-8510 Japan +81-75-383-2450 +81-75-383-2448
| | - Takeshi Yanagida
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8654 Japan
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Shen Y, Cui M, Takaishi S, Kawasoko H, Sugimoto K, Tsumuraya T, Otsuka A, Kwon E, Yoshida T, Hoshino N, Kawachi K, Kasama Y, Akutagawa T, Fukumura T, Yamashita M. Heterospin frustration in a metal-fullerene-bonded semiconductive antiferromagnet. Nat Commun 2022; 13. [PMID: 35078998 PMCID: PMC8789904 DOI: 10.1038/s41467-022-28134-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 01/11/2022] [Indexed: 11/24/2022] Open
Abstract
Lithium-ion-encapsulated fullerenes (Li+@C60) are 3D superatoms with rich oxidative states. Here we show a conductive and magnetically frustrated metal–fullerene-bonded framework {[Cu4(Li@C60)(L)(py)4](NTf2)(hexane)}n (1) (L = 1,2,4,5-tetrakis(methanesulfonamido)benzene, py = pyridine, NTf2− = bis(trifluoromethane)sulfonamide anion) prepared from redox-active dinuclear metal complex Cu2(L)(py)4 and lithium-ion-encapsulated fullerene salt (Li+@C60)(NTf2−). Electron donor Cu2(L)(py)2 bonds to acceptor Li+@C60 via eight Cu‒C bonds. Cu–C bond formation stems from spontaneous charge transfer (CT) between Cu2(L)(py)4 and (Li+@C60)(NTf2−) by removing the two-terminal py molecules, yielding triplet ground state [Cu2(L)(py)2]+(Li+@C60•−), evidenced by absorption and electron paramagnetic resonance (EPR) spectra, magnetic properties and quantum chemical calculations. Moreover, Li+@C60•− radicals (S = ½) and Cu2+ ions (S = ½) interact antiferromagnetically in triangular spin lattices in the absence of long-range magnetic ordering to 1.8 K. The low-temperature heat capacity indicated that compound 1 is a potential candidate for an S = ½ quantum spin liquid (QSL). Conductive and magnetically frustrated solids may enable the development of high-performance molecule-based spintronic devices. Here the authors report a conductive and magnetically frustrated metal–fullerene-bonded framework prepared from a redox-active dinuclear copper complex and lithium ion-encapsulated fullerenes.
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Velasco V, Silva Neto MB, Perali A, Wimberger S, Bishop AR, Conradson SD. Evolution of Charge-Lattice Dynamics across the Kuramoto Synchronization Phase Diagram of Quantum Tunneling Polarons in Cuprate Superconductors. Condensed Matter 2021; 6:52. [DOI: 10.3390/condmat6040052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Because of its sensitivity to the instantaneous structure factor, S(Q,t = 0), Extended X-ray Absorption Fine Structure (EXAFS) is a powerful tool for probing the dynamic structure of condensed matter systems in which the charge and lattice dynamics are coupled. When applied to hole-doped cuprate superconductors, EXAFS has revealed the presence of internal quantum tunneling polarons (IQTPs). An IQTP arises in EXAFS as a two-site distribution for certain Cu–O pairs, which is also duplicated in inelastic scattering but not observed in standard diffraction measurements. The Cu–Sr pair distribution has been found to be highly anharmonic and strongly correlated to both the IQTPs and to superconductivity, as, for example, in YSr2Cu2.75Mo0.25O7.54(Tc=84 K). In order to describe such nontrivial, anharmonic charge-lattice dynamics, we have proposed a model Hamiltonian for a prototype six-atom cluster, in which two Cu-apical-O IQTPs are charge-transfer bridged through Cu atoms by an O atom in the CuO2 plane and are anharmonically coupled via a Sr atom. By applying an exact diagonalization procedure to this cluster, we have verified that our model indeed produces an intricate interplay between charge and lattice dynamics. Then, by using the Kuramoto model for the synchronization of coupled quantum oscillators, we have found a first-order phase transition for the IQTPs into a synchronized, phase-locked phase. Most importantly, we have shown that this transition results specifically from the anharmonicity. Finally, we have provided a phase diagram showing the onset of the phase-locking of IQTPs as a function of the charge-lattice and anharmonic couplings in our model. We have found that the charge, initially confined to the apical oxygens, is partially pumped into the CuO2 plane in the synchronized phase, which suggests a possible connection between the synchronized dynamic structure and high-temperature superconductivity (HTSC) in doped cuprates.
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15
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Jin M, Yu P, Fan C, Li Q, Kong P, Shen Z, Qin X, Chi Z, Jin C, Liu G, Zhong G, Xu G, Liu Z, Zhu J. Discovery of Dome-Shaped Superconducting Phase and Anisotropic Transport in a van der Waals Layered Candidate NbIrTe 4 under Pressure. Adv Sci (Weinh) 2021; 8:e2103250. [PMID: 34723437 PMCID: PMC8693038 DOI: 10.1002/advs.202103250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 08/26/2021] [Indexed: 06/13/2023]
Abstract
The unique electronic structure and crystal structure driven by external pressure in transition metal tellurides (TMTs) can host unconventional quantum states. Here, the discovery of pressure-induced phase transition at ≈2 GPa, and dome-shaped superconducting phase emerged in van der Waals layered NbIrTe4 is reported. The highest critical temperature (Tc ) is ≈5.8 K at pressure of ≈16 GPa, where the interlayered Te-Te covalent bonds form simultaneously derived from the synchrotron diffraction data, indicating the hosting structure of superconducting evolved from low-pressure two-dimensional (2D) phase to three-dimensional (3D) structure with pressure higher than 30 GPa. Strikingly, the authors have found an anisotropic transport in the vicinity of the superconducting state, suggesting the emergence of a "stripe"-like phase. The dome-shaped superconducting phase and anisotropic transport are possibly due to the spatial modulation of interlayer Josephson coupling .
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Affiliation(s)
- Meiling Jin
- Department of Physics and Shenzhen Engineering Research Center for Frontier Materials Synthesis at High PressuresSouthern University of Science and Technology (SUSTech)Shenzhen518055China
- Center for High Pressure Science and Technology Advanced Research (HPSTAR)Beijing100094China
| | - Peng Yu
- State Key Laboratory of Optoelectronic Materials and TechnologiesSchool of Materials Science and EngineeringSun Yat‐sen UniversityGuangzhou510275China
| | - Changzeng Fan
- State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao066004China
| | - Qiang Li
- Department of PhysicsShanghai Normal UniversityShanghai200234China
| | - Panlong Kong
- Center for High Pressure Science and Technology Advanced Research (HPSTAR)Beijing100094China
| | - Zhiwei Shen
- State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao066004China
| | - Xiaomei Qin
- Department of PhysicsShanghai Normal UniversityShanghai200234China
| | - Zhenhua Chi
- Institute of High Pressure PhysicsSchool of Physical Science and TechnologyNingbo UniversityNingbo315211China
| | - Changqing Jin
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesSchool of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100190China
| | - Guangtong Liu
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesSchool of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100190China
| | - Guyue Zhong
- Wuhan National High Magnetic Field Center and School of PhysicsHuazhong University of Science and TechnologyWuhan430074China
| | - Gang Xu
- Wuhan National High Magnetic Field Center and School of PhysicsHuazhong University of Science and TechnologyWuhan430074China
| | - Zheng Liu
- School of Materials Science and EngineeringNanyang Technological University50 Nanyang AvenueSingapore639798Singapore
- School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore639798Singapore
| | - Jinlong Zhu
- Department of Physics and Shenzhen Engineering Research Center for Frontier Materials Synthesis at High PressuresSouthern University of Science and Technology (SUSTech)Shenzhen518055China
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Sederholm L, Conradson SD, Geballe TH, Jin C, Gauzzi A, Gilioli E, Karppinen M, Baldinozzi G. Extremely Overdoped Superconducting Cuprates via High Pressure Oxygenation Methods. Condensed Matter 2021; 6:50. [DOI: 10.3390/condmat6040050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Within the cuprate constellation, one fixed star has been the superconducting dome in the quantum phase diagram of transition temperature vs. the excess charge on the Cu in the CuO2-planes, p, resulting from O-doping or cation substitution. However, a more extensive search of the literature shows that the loss of the superconductivity in favor of a normal Fermi liquid on the overdoped side should not be assumed. Many experimental results from cuprates prepared by high-pressure oxygenation show Tc converging to a fixed value or continuing to slowly increase past the upper limit of the dome of p = 0.26–0.27, up to the maximum amounts of excess oxygen corresponding to p values of 0.3 to > 0.6. These reports have been met with disinterest or disregard. Our review shows that dome-breaking trends for Tc are, in fact, the result of careful, accurate experimental work on a large number of compounds. This behavior most likely mandates a revision of the theoretical basis for high-temperature superconductivity. That excess O atoms located in specific, metastable sites in the crystal, attainable only with extreme O chemical activity under HPO conditions, cause such a radical extension of the superconductivity points to a much more substantial role for the lattice in terms of internal chemistry and bonding.
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Zhao J, Chen K, Li SE, Zhang Q, Wang JO, Guo EJ, Qian H, Gu L, Qian T, Ibrahim K, Fan Z, Guo H. Electronic-structure evolution of SrFeO 3-xduring topotactic phase transformation. J Phys Condens Matter 2021; 34:064001. [PMID: 34740209 DOI: 10.1088/1361-648x/ac36fd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Accepted: 11/05/2021] [Indexed: 06/13/2023]
Abstract
Oxygen-vacancy-induced topotactic phase transformation between the ABO2.5brownmillerite structure and the ABO3perovskite structure attracts ever-increasing attention due to the perspective applications in catalysis, clean energy field, and memristors. However, a detailed investigation of the electronic-structure evolution during the topotactic phase transformation for understanding the underlying mechanism is highly desired. In this work, multiple analytical methods were used to explore evolution of the electronic structure of SrFeO3-xthin films during the topotactic phase transformation. The results indicate that the increase in oxygen content induces a new unoccupied state of O 2pcharacter near the Fermi energy, inducing the insulator-to-metal transition. More importantly, the hole states are more likely constrained to thedx2-y2orbital than to thed3z2-r2orbital. Our results reveal an unambiguous evolution of the electronic structure of SrFeO3-xfilms during topotactic phase transformation, which is crucial not only for fundamental understanding but also for perspective applications such as solid-state oxide fuel cells, catalysts, and memristor devices.
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Affiliation(s)
- Jiali Zhao
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Kaihui Chen
- Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, People's Republic of China
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, People's Republic of China
| | - Shi-En Li
- Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, People's Republic of China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Jia-Ou Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Er-Jia Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Haijie Qian
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Tian Qian
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Kurash Ibrahim
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Zhen Fan
- Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, People's Republic of China
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, People's Republic of China
| | - Haizhong Guo
- Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, People's Republic of China
- Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, People's Republic of China
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Singh SJ, Chinnamuthu P. Highly efficient natural-sunlight-driven photodegradation of organic dyes with combustion derived Ce-doped CuO nanoparticles. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126864] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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19
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Kim G, Rabinovich KS, Boris AV, Yaresko AN, Suyolcu YE, Wu YM, van Aken PA, Christiani G, Logvenov G, Keimer B. Optical conductivity and superconductivity in highly overdoped La 2-x Ca x CuO 4 thin films. Proc Natl Acad Sci U S A 2021; 118:e2106170118. [PMID: 34301905 DOI: 10.1073/pnas.2106170118] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Chemical substitution is widely used to modify the charge-carrier concentration (“doping”) in complex quantum materials, but the influence of the associated structural disorder on the electronic phase behavior remains poorly understood. We synthesized thin films of the high-temperature superconductor La2−xCaxCuO4 with minimal structural disorder and characterized their doping levels through measurements of the optical conductivity. We find that superconductivity with Tc = 15 to 20 K is stable up to much higher doping levels than previously found for analogous compounds with stronger disorder. The results imply that doping-induced disorder is the leading cause of the degradation of superconductivity for large carrier concentration, and they open up a previously inaccessible regime of the phase diagram of high-temperature superconductors to experimental investigation. We have used atomic layer-by-layer oxide molecular beam epitaxy to grow epitaxial thin films of La2−xCaxCuO4 with x up to 0.5, greatly exceeding the solubility limit of Ca in bulk systems (x∼0.12). A comparison of the optical conductivity measured by spectroscopic ellipsometry to prior predictions from dynamical mean-field theory demonstrates that the hole concentration p is approximately equal to x. We find superconductivity with Tc of 15 to 20 K up to the highest doping levels and attribute the unusual stability of superconductivity in La2−xCaxCuO4 to the nearly identical radii of La and Ca ions, which minimizes the impact of structural disorder. We conclude that careful disorder management can greatly extend the “superconducting dome” in the phase diagram of the cuprates.
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20
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Aramburu JA, Moreno M. Key Role of Deep Orbitals in the d x2-y2-d 3z2-r2 Gap in Tetragonal Complexes and 10 Dq. J Phys Chem A 2021; 125:2284-2293. [PMID: 33724839 PMCID: PMC8459450 DOI: 10.1021/acs.jpca.0c11609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Using first-principles calculations,
we show that the origin of
the intrinsic a1g(∼3z2 – r2)–b1g(∼x2 – y2) splitting,
Δint, in tetragonal transition-metal complexes and
the variations of the cubic field splitting, 10Dq, with the metal–ligand distance, R, are
much more subtle than commonly thought. As a main novelty, the key
role played by covalent bonding with deep valence ligand levels and
thus the inadequacy of too simple models often used for the present
goal is stressed. Taking as a guide the isolated D4h CuF64– complex, it is proved that
Δint essentially arises from bonding with deep 2s(F)
orbitals despite them lying ∼23 eV below 2p(F) orbitals. This
conclusion, although surprising, is also supported by results on octahedral
fluoride complexes where the contribution to 10Dq splitting from bonding with 2s(F) orbitals is behind its strong R dependence, stressing that explanations based on the crystal-field
approach are simply meaningless.
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Affiliation(s)
- J A Aramburu
- Departamento de Ciencias de la Tierra y Física de la Materia Condensada, Universidad de Cantabria, Avenida de los Castros s/n, 39005 Santander, Spain
| | - M Moreno
- Departamento de Ciencias de la Tierra y Física de la Materia Condensada, Universidad de Cantabria, Avenida de los Castros s/n, 39005 Santander, Spain
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21
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Kopnin EM. Layered Cuprates Containing Flat Fragments: High-Pressure Synthesis, Crystal Structures and Superconducting Properties. Molecules 2021; 26:1862. [PMID: 33806143 PMCID: PMC8037682 DOI: 10.3390/molecules26071862] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 03/23/2021] [Accepted: 03/23/2021] [Indexed: 11/16/2022] Open
Abstract
High-pressure synthesis and crystal structures of the homologous series AuBa2(Ca,Ln)n-1CunO2n+3 (n = 1-4; Ln = rare-earth cations) are described. Their crystal structures and superconducting properties are compared with the corresponding members of the Hg-homologous series. Numerous cuprates containing flat structural fragments (CuO4, CO3 and BO3) synthesized mainly at high pressure are compared in terms of structural peculiarities and superconducting properties. Importance and future prospects of high-pressure application for the preparation of new superconducting oxides are discussed.
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Affiliation(s)
- Evgeny M Kopnin
- Pirelli Tyre SpA, Via Piero e Alberto Pirelli, 25, I-20126 Milan, Italy
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Zhao J, Gao J, Li W, Qian Y, Shen X, Wang X, Shen X, Hu Z, Dong C, Huang Q, Cao L, Li Z, Zhang J, Ren C, Duan L, Liu Q, Yu R, Ren Y, Weng SC, Lin HJ, Chen CT, Tjeng LH, Long Y, Deng Z, Zhu J, Wang X, Weng H, Yu R, Greenblatt M, Jin C. A combinatory ferroelectric compound bridging simple ABO 3 and A-site-ordered quadruple perovskite. Nat Commun 2021; 12:747. [PMID: 33531480 DOI: 10.1038/s41467-020-20833-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Accepted: 12/22/2020] [Indexed: 12/02/2022] Open
Abstract
The simple ABO3 and A-site-ordered AA′3B4O12 perovskites represent two types of classical perovskite functional materials. There are well-known simple perovskites with ferroelectric properties, while there is still no report of ferroelectricity due to symmetry breaking transition in A-site-ordered quadruple perovskites. Here we report the high pressure synthesis of an A-site-ordered perovskite PbHg3Ti4O12, the only known quadruple perovskite that transforms from high-temperature centrosymmetric paraelectric phase to low-temperature non-centrosymmetric ferroelectric phase. The coordination chemistry of Hg2+ is changed from square planar as in typical A-site-ordered quadruple perovskite to a rare stereo type with 8 ligands in PbHg3Ti4O12. Thus PbHg3Ti4O12 appears to be a combinatory link from simple ABO3 perovskites to A-site-ordered AA′3Ti4O12 perovskites, sharing both displacive ferroelectricity with former and structure coordination with latter. This is the only example so far showing ferroelectricity due to symmetry breaking phase transition in AA′3B4O12-type A-site-ordered perovskites, and opens a direction to search for ferroelectric materials. There are few reports of ferroelectricity due to symmetry breaking transition in A-site-ordered quadruple perovskites. Here, the authors find one with phase transition from a high-temperature centrosymmetric paraelectric phase to a low-temperature non-centrosymmetric ferroelectric phase in a high pressure synthesized compound.
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Conradson SD, Geballe TH, Jin CQ, Cao LP, Gauzzi A, Karppinen M, Baldinozzi G, Li WM, Gilioli E, Jiang JM, Latimer M, Mueller O, Nasretdinova V. Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr 2Cu 2.75Mo 0.25O 7.54 and Sr 2CuO 3.3. Proc Natl Acad Sci U S A 2020; 117:33099-106. [PMID: 33318194 DOI: 10.1073/pnas.2018336117] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The Cu extended X-ray absorption fine structure of YSr2Cu2.75Mo0.25O7.54 (with superconducting critical temperature, Tc, = 84 K) and Sr2CuO3.3 (Tc = 95 K) through their superconducting transitions demonstrates that the common factor in superconductivity in cuprates, including those prepared by high-pressure oxygenation, is an internal quantum tunneling polaron in its dynamical structure. In addition, Sr2CuO3.3 is the first material to show a concomitant transformation in this structure involving atom displacements >1 Å that would be expected to modify its Fermi surface, which would complicate the transition beyond a purely electronic one consisting of the pairing of electrons of opposite momentum across fixed electronic states. A crucial issue in cuprates is the extent and mechanism of the coupling of the lattice to the electrons and the superconductivity. Here we report Cu K edge extended X-ray absorption fine structure measurements elucidating the internal quantum tunneling polaron (iqtp) component of the dynamical structure in two heavily overdoped superconducting cuprate compounds, tetragonal YSr2Cu2.75Mo0.25O7.54 with superconducting critical temperature, Tc = 84 K and hole density p = 0.3 to 0.5 per planar Cu, and the tetragonal phase of Sr2CuO3.3 with Tc = 95 K and p = 0.6. In YSr2Cu2.75Mo0.25O7.54 changes in the Cu-apical O two-site distribution reflect a sequential renormalization of the double-well potential of this site beginning at Tc, with the energy difference between the two minima increasing by ∼6 meV between Tc and 52 K. Sr2CuO3.3 undergoes a radically larger transformation at Tc, >1-Å displacements of the apical O atoms. The principal feature of the dynamical structure underlying these transformations is the strongly anharmonic oscillation of the apical O atoms in a double-well potential that results in the observation of two distinct O sites whose Cu–O distances indicate different bonding modes and valence-charge distributions. The coupling of the superconductivity to the iqtp that originates in this nonadiabatic coupling between the electrons and lattice demonstrates an important role for the dynamical structure whereby pairing occurs even in a system where displacements of the atoms that are part of the transition are sufficiently large to alter the Fermi surface. The synchronization and dynamic coherence of the iqtps resulting from the strong interactions within a crystal would be expected to influence this process.
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25
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Li WM, Zhao JF, Cao LP, Hu Z, Huang QZ, Wang XC, Liu Y, Zhao GQ, Zhang J, Liu QQ, Yu RZ, Long YW, Wu H, Lin HJ, Chen CT, Li Z, Gong ZZ, Guguchia Z, Kim JS, Stewart GR, Uemura YJ, Uchida S, Jin CQ. Reply to Yamamoto: A cuprate superconductor with unconventional features. Proc Natl Acad Sci U S A 2019; 116:18166-7. [PMID: 31506378 DOI: 10.1073/pnas.1911170116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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26
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Conradson SD, Geballe TH, Gauzzi A, Karppinen M, Jin C, Baldinozzi G, Li W, Cao L, Gilioli E, Jiang JM, Latimer M, Mueller O, Nasretdinova V. Local lattice distortions and dynamics in extremely overdoped superconducting YSr 2Cu 2.75Mo 0.25O 7.54. Proc Natl Acad Sci U S A 2020; 117:4559-64. [PMID: 32071213 DOI: 10.1073/pnas.1918704117] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A common characteristic of many "overdoped" cuprates prepared with high-pressure oxygen is T c values ≥ 50 K that often exceed that of optimally doped parent compounds, despite O stoichiometries that place the materials at the edge or outside of the conventional boundary between superconducting and normal Fermi liquid states. X-ray absorption fine-structure (XAFS) measurements at 52 K on samples of high-pressure oxygen (HPO) YSr2Cu2.75Mo0.25O7.54, T c = 84 K show that the Mo is in the (VI) valence in an unusually undistorted octahedral geometry with predominantly Mo neighbors that is consistent with its assigned substitution for Cu in the chain sites of the structure. Perturbations of the Cu environments are minimal, although the Cu X-ray absorption near-edge structure (XANES) differs from that in other cuprates. The primary deviation from the crystal structure is therefore nanophase separation into Mo- and Cu-enriched domains. There are, however, indications that the dynamical attributes of the structure are altered relative to YBa2Cu3O7, including a shift of the Cu-apical O two-site distribution from the chain to the plane Cu sites. Another effect that would influence T c is the possibility of multiple bands at the Fermi surface caused by the presence of the second phase and the lowering of the Fermi level.
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Conradson SD, Geballe TH, Jin C, Cao L, Baldinozzi G, Jiang JM, Latimer MJ, Mueller O. Local structure of Sr 2CuO 3.3, a 95 K cuprate superconductor without CuO 2 planes. Proc Natl Acad Sci U S A 2020; 117:4565-70. [PMID: 32060125 DOI: 10.1073/pnas.1918890117] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The local structure of the highly "overdoped" 95 K superconductor Sr2CuO3.3 determined by Cu K X-ray absorption fine structure (XAFS) at 62 K in magnetically oriented samples shows that 1) the magnetization is perpendicular to the c axis; 2) at these levels of precision the Cu sublattice is tetragonal in agreement with the crystal structure; the O sublattice has 3) continuous -Cu-O- chains that orient perpendicular to an applied magnetic field; 4) approximately half-filled -Cu-O- chains that orient parallel to this field; 5) a substantial number of apical O vacancies; 6) O ions at some apical positions with expanded Cu-O distances; and 7) interstitial positions that imply highly displaced Sr ions. These results contradict the universally accepted features of cuprates that require intact CuO2 planes, magnetization along the c axis, and a termination of the superconductivity when the excess charge on the CuO2 Cu ions exceeds 0.27. These radical differences in charge and structure demonstrate that this compound constitutes a separate class of Cu-O-based superconductors in which the superconductivity originates in a different, more complicated structural unit than CuO2 planes while retaining exceptionally high transition temperatures.
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Abstract
This Feature Article highlights the use of mixed-metal single source precursors to directly access useful complex metal oxide materials.
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Affiliation(s)
- Haijiao Lu
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
- Department of Chemistry
| | | | - Sebastian D. Pike
- Department of Chemistry
- University of Cambridge
- Cambridge
- UK
- Department of Chemistry
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