Cobalt-Dimer Nitrides:A Potential Novel Family of High-Temperature Superconductors  

作　　者：Yuhao Gu Kun Jiang Xianxin Wu Jiangping Hu 顾雨豪;蒋坤;吴贤新;胡江平(Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China;Kavli Institute of Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [3]Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [4]Kavli Institute of Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Chinese Physics Letters》2022年第9期67-71,共5页中国物理快报（英文版）

基　　金：supported by the National Key Basic Research Program of China(Grant No.2017YFA0303100);the National Natural Science Foundation of China(Grant Nos.11888101 and 12174428);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB28000000);the Chinese Academy of Sciences Project for Young Scientists in Basic Research(Grant No.YBR-048)。

摘　　要：We predict that the square lattice layer formed by[Co_(2)N_(2)]_(2)-diamond-like units can host high-temperature superconductivity.The layer appears in the stable ternary cobalt nitride,Ba Co_(2)N_(2).The electronic physics of the material stems from Co_(2)N_(2)layers where the dimerized Co pairs form a square lattice.The low energy physics near Fermi energy can be described by an effective two-orbital model.Without considering interlayer couplings,the two orbitals are effectively decoupled.This electronic structure satisfies the“gene”character proposed for unconventional high-temperature superconductors.We predict that the leading superconducting pairing instability is driven from an extended s-wave(s^(±))to a d-wave by hole doping,e.g.,in Ba_(1-x) K_(x) Co_(2)N_(2).This study provides a new platform to establish the superconducting mechanism of unconventional high-temperature superconductivity.

关 键 词：SUPERCONDUCTIVITY satis COBALT 

分 类 号：O511.3[一般工业技术—材料科学与工程]