Theoretical studies of superconductivity in doped BaCoSO

doi:10.1007/s11467-018-0745-7

Front. Phys.

2018, Vol. 13

Issue (3) : 137502 https://doi.org/10.1007/s11467-018-0745-7

RESEARCH ARTICLE

Theoretical studies of superconductivity in doped BaCoSO

Shengshan Qin^1,², Yinxiang Li¹, Qiang Zhang¹, Congcong Le^1,³, Jiangping Hu^1,^3,⁴(

)

¹. Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
². University of Chinese Academy of Science, Beijing 100049, China
³. Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
⁴. Collaborative Innovation Center of Quantum Matter, Beijing 100190, China

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Abstract

We investigate superconductivity that may exist in the doped BaCoSO, a multi-orbital Mott insulator with a strong antiferromagnetic ground state. The superconductivity is studied in both t-J type and Hubbard type multi-orbital models by mean field approach and random phase approximation (RPA) analysis. Even if there is no C₄ rotational symmetry, it is found that the system still carries a d-wave like pairing symmetry state with gapless nodes and sign changed superconducting order parameters on Fermi surfaces. The results are largely doping insensitive. In this superconducting state, the three t_2g orbitals have very different superconducting form factors in momentum space. In particular, th intra-orbital pairing of the d_x²_–_y² orbital has an s-wave like pairing form factor. The two methods also predict very different pairing strength on different parts of Fermi surfaces. These results suggest that BaCoSO and related materials can be a new ground to test and establish fundamental principles for unconventional high temperature superconductivity.

Keywords unconventional superconductivity pairing symmetry

Corresponding Author(s): Jiangping Hu

Issue Date: 07 March 2018

Cite this article:

Shengshan Qin,Yinxiang Li,Qiang Zhang, et al. Theoretical studies of superconductivity in doped BaCoSO[J]. Front. Phys. , 2018, 13(3): 137502.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-018-0745-7
https://academic.hep.com.cn/fop/EN/Y2018/V13/I3/137502

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