Pairing symmetry in monolayer of orthorhombic CoSb  

作　　者：Tian-Zhong Yuan Mu-Yuan Zou Wen-Tao Jin Xin-Yuan Wei Xu-Guang Xu Wei Li 

机构地区：[1]State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China [2]Key Laboratory of Micro-Nano Measurement-Manipulation and Physics(Ministry of Education),School of Physics,Beihang University,Beijing 100191,China [3]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [4]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

出　　处：《Frontiers of physics》2021年第4期185-194,共10页物理学前沿（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.11927807);the Natural Science Foundation of Shanghai of China(Grant Nos.19ZR1402600 and 20DZ1100604)。

摘　　要：Ferromagnetism and superconductivity are generally considered to be antagonistic phenomena in condensed matter physics.Here,we theoretically study the interplay between the ferromagnetic and superconducting orders in a recent discovered monolayered CoSb superconductor with an orthorhombic symmetry and net magnetization,and demonstrate the pairing symmetry of CoSb as a candidate of non-unitary superconductor with time-reversal symmetry breaking.By performing the group theory analysis and the first-principles calculations,the superconducting order parameter is suggested to be a triplet pairing with the irreducible representation of 3B2u,which displays intriguing nodal points and non-zero periodic modulation of Cooper pair spin polarization on the Fermi surface topologies.These findings not only provide a significant theoretical insight into the coexistence of superconductivity and ferromagnetism,but also reveal the exotic spin polarized Cooper pairing driven by ferromagnetic spin fluctuations in a triplet superconductor.

关 键 词：SUPERCONDUCTIVITY FERROMAGNETISM non-unitary pair 

分 类 号：O57[理学—粒子物理与原子核物理]