关键词: 自旋轨道耦合/
超导体/
化学键
English Abstract
Crystal structures and physical properties of novel 4d/5d based superconductors
Song Yan-Peng1,2,Chen Hong-Xiang1,2,
Guo Jian-Gang1,
Chen Xiao-Long1,2
1.Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant No. 51772322).Received Date:22 April 2018
Accepted Date:06 May 2018
Published Online:20 June 2019
Abstract:The interplay among spin, orbital and lattice in a strongly-correlated electron system attracts a lot of attention in the community of condensed matter physics. The competition and collaboration of these effects result in multiple ground states, such as superconductivity, quantum criticality state, topological phase transition, metallic-insulating transition, etc. As is well known, the spin-orbital coupling is an interaction between the spin angular moment and orbit angular moment. In quantum mechanics, the spin-orbital coupling can be described as an additional interaction in the Hamitonian. For a compound containing heavy elements, the spin-orbital interaction becomes nontrival and can influence the ground states. For instance, in 4d/5d based superconductors, the superconducting pairing mechanism might be significantly different from that of conventional Bardeen-Cooper-Schrieffer superconductor. In this paper, we will summarize the structures and physical properties of several typical 4d/5d transition metal-based superconductors and discuss the intrinsic relationship between them. Importantly, the strength of anionic covalent bonds can determine the phase transition and superconductivity, which will be highlighted here.
Keywords: spin-orbit coupling/
superconductor/
chemical bonds
