Pairing symmetry in layered BiS2 compounds driven by electron-electron correlation
Abstract
We investigate the pairing symmetry of layered BiS2 compounds by assuming that electron-electron correlation is still important so that the pairing is rather short range. We find that the extended s-wave pairing symmetry always wins over d-wave when the pairing is confined between two short range sites up to next nearest neighbors. The pairing strength is peaked around the doping level x = 0.5, which is consistent with experimental observation. The extended s-wave pairing symmetry is very robust against spin-orbital coupling because it is mainly determined by the structure of Fermi surfaces. Moreover, the extended s-wave pairing can be distinguished from conventional swave pairing by measuring and comparing superconducting gaps of different Fermi surfaces.
- Publication:
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Frontiers of Physics
- Pub Date:
- April 2014
- DOI:
- 10.1007/s11467-013-0407-8
- arXiv:
- arXiv:1211.5435
- Bibcode:
- 2014FrPhy...9..194L
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- 5 pages and 6 figures