Pairing symmetry in monolayer of orthorhombic CoSb

doi:10.1007/s11467-020-1040-y

Front. Phys.

2021, Vol. 16

Issue (4) : 43500 https://doi.org/10.1007/s11467-020-1040-y

RESEARCH ARTICLE

Pairing symmetry in monolayer of orthorhombic CoSb

Tian-Zhong Yuan¹, Mu-Yuan Zou¹, Wen-Tao Jin², Xin-Yuan Wei¹, Xu-Guang Xu³(

), Wei Li^1,⁴(

)

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

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Abstract

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 ³B₂_u, 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.

Keywords superconductivity ferromagnetism non-unitary pair

Corresponding Author(s): Xu-Guang Xu,Wei Li

Issue Date: 16 March 2021

Cite this article:

Tian-Zhong Yuan,Mu-Yuan Zou,Wen-Tao Jin, et al. Pairing symmetry in monolayer of orthorhombic CoSb[J]. Front. Phys. , 2021, 16(4): 43500.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-020-1040-y
https://academic.hep.com.cn/fop/EN/Y2021/V16/I4/43500

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