2017/02/27 by Shengshan Qin, Yinxiang Li, Qiang Zhang +2 · 1 citation
Materials Science · Physics and Astronomy · #Condensed matter physics #Doping #Engineering physics #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Materials science #Physics #Physics of Superconductivity and Magnetism #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1007/s11467-018-0745-7
published as Front. Phys. (2018) 13: 137502 · 6 pages, 7 figures
arxiv created 2017/02/27 · openalex publication_date 2018/02/16 · arxiv updated 2018/06/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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, the 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.