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Structure Responsible for the Superconducting State in La3Ni2O7 at High-Pressure and Low-Temperature Conditions.
Wang, Luhong; Li, Yan; Xie, Sheng-Yi; Liu, Fuyang; Sun, Hualei; Huang, Chaoxin; Gao, Yang; Nakagawa, Takeshi; Fu, Boyang; Dong, Bo; Cao, Zhenhui; Yu, Runze; Kawaguchi, Saori I; Kadobayashi, Hirokazu; Wang, Meng; Jin, Changqing; Mao, Ho-Kwang; Liu, Haozhe.
Afiliación
  • Wang L; Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments, Shanghai Advanced Research in Physical Sciences, Shanghai 201203, China.
  • Li Y; State Key Lab of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
  • Xie SY; School of Physics and Electronics, Hunan University, Changsha 410082, China.
  • Liu F; Center for High Pressure Science & Technology Advanced Research, Beijing 100094, China.
  • Sun H; School of Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China.
  • Huang C; Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China.
  • Gao Y; Center for High Pressure Science & Technology Advanced Research, Beijing 100094, China.
  • Nakagawa T; Center for High Pressure Science & Technology Advanced Research, Beijing 100094, China.
  • Fu B; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China.
  • Dong B; Harbin Institute of Technology, Harbin 150001, China.
  • Cao Z; State Key Lab of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
  • Yu R; Center for High Pressure Science & Technology Advanced Research, Beijing 100094, China.
  • Kawaguchi SI; Japan Synchrotron Radiation Research Institute, SPring-8, Sayo-gun Hyogo 679-5198, Japan.
  • Kadobayashi H; Japan Synchrotron Radiation Research Institute, SPring-8, Sayo-gun Hyogo 679-5198, Japan.
  • Wang M; Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China.
  • Jin C; Beijing National Lab for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  • Mao HK; Shanghai Advanced Research in Physical Sciences, Shanghai 201203, China.
  • Liu H; Center for High Pressure Science & Technology Advanced Research, Beijing 100094, China.
J Am Chem Soc ; 146(11): 7506-7514, 2024 Mar 20.
Article en En | MEDLINE | ID: mdl-38457476
ABSTRACT
Very recently, a new superconductor with Tc = 80 K has been reported in nickelate (La3Ni2O7) at around 15-40 GPa conditions (Nature, 621, 493, 2023), which is the second type of unconventional superconductor, besides cuprates, with Tc above liquid nitrogen temperature. However, the phase diagram plotted in this report was mostly based on the transport measurement under low-temperature and high-pressure conditions, and the assumed corresponding X-ray diffraction (XRD) results were carried out at room temperature. This encouraged us to carry out in situ high-pressure and low-temperature synchrotron XRD experiments to determine which phase is responsible for the high Tc state. In addition to the phase transition from the orthorhombic Amam structure to the orthorhombic Fmmm structure, a tetragonal phase with the space group of I4/mmm was discovered when the sample was compressed to around 19 GPa at 40 K where the superconductivity takes place in La3Ni2O7. The calculations based on this tetragonal structure reveal that the electronic states that approached the Fermi energy were mainly dominated by the eg orbitals (3dz2 and 3dx2-y2) of Ni atoms, which are located in the oxygen octahedral crystal field. The correlation between Tc and this structural evolution, especially Ni-O octahedra regularity and the in-plane Ni-O-Ni bonding angles, is analyzed. This work sheds new light to identify what is the most likely phase responsible for superconductivity in double-layered nickelate.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Am Chem Soc Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Am Chem Soc Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos