1
|
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. Superconductivity in a unique type of copper oxide. Proc Natl Acad Sci U S A 2019; 116:12156-12160. [PMID: 31109998 PMCID: PMC6589659 DOI: 10.1073/pnas.1900908116] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [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] [Indexed: 11/18/2022] Open
Abstract
The mechanism of superconductivity in cuprates remains one of the big challenges of condensed matter physics. High-T c cuprates crystallize into a layered perovskite structure featuring copper oxygen octahedral coordination. Due to the Jahn Teller effect in combination with the strong static Coulomb interaction, the octahedra in high-T c cuprates are elongated along the c axis, leading to a 3dx 2-y 2 orbital at the top of the band structure wherein the doped holes reside. This scenario gives rise to 2D characteristics in high-T c cuprates that favor d-wave pairing symmetry. Here, we report superconductivity in a cuprate Ba2CuO4-y , wherein the local octahedron is in a very exceptional compressed version. The Ba2CuO4-y compound was synthesized at high pressure at high temperatures and shows bulk superconductivity with critical temperature (T c ) above 70 K at ambient conditions. This superconducting transition temperature is more than 30 K higher than the T c for the isostructural counterparts based on classical La2CuO4 X-ray absorption measurements indicate the heavily doped nature of the Ba2CuO4-y superconductor. In compressed octahedron, the 3d3z 2-r 2 orbital will be lifted above the 3dx 2-y 2 orbital, leading to significant 3D nature in addition to the conventional 3dx 2-y 2 orbital. This work sheds important light on advancing our comprehensive understanding of the superconducting mechanism of high T c in cuprate materials.
Collapse
Affiliation(s)
- W M Li
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
| | - J F Zhao
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - L P Cao
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - Z Hu
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straβe 40, 01187 Dresden, Germany
| | - Q Z Huang
- NIST Center for Neutron Research, Gaithersburg, MD 20899
| | - X C Wang
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
| | - Y Liu
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - G Q Zhao
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - J Zhang
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - Q Q Liu
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
| | - R Z Yu
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
| | - Y W Long
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
| | - H Wu
- NIST Center for Neutron Research, Gaithersburg, MD 20899
| | - H J Lin
- National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan
| | - C T Chen
- National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan
| | - Z Li
- School of Materials Science and Engineering, Nanjing University of Science and Technology, 210094 Nanjing, China
| | - Z Z Gong
- Department of Physics, Columbia University, New York, NY 10027
| | - Z Guguchia
- Department of Physics, Columbia University, New York, NY 10027
| | - J S Kim
- Department of Physics, University of Florida, Gainesville, FL 32611
| | - G R Stewart
- Department of Physics, University of Florida, Gainesville, FL 32611
| | - Y J Uemura
- Department of Physics, Columbia University, New York, NY 10027
| | - S Uchida
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
- Department of Physics, University of Tokyo, 113-0033 Tokyo, Japan
| | - C Q Jin
- Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China;
- School of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 100190 Beijing, China
- Materials Research Lab at Songshan Lake, 523808 Dongguan, China
| |
Collapse
|