Triplet pairing and possible weak topological superconductivity in BiS2-based superconductors
Yang Yang, Wan-Sheng Wang, Yuan-Yuan Xiang, Zheng-Zao Li, Qiang-Hua Wang
DOI 10.1103/PhysRevB.88.094519 · Physical Review B
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Abstract
We show that the newly discovered BiS2-based superconductors may have a dominant triplet pairing component in addition to a subdominant singlet component arising from the spin-orbital coupling. The pairing respects time-reversal symmetry. The dominant triplet gap causes gap sign changes between the spin-split Fermi pockets. Within a pocket, the gap function respects dx2−y2*-wave symmetry where the asterisk indicates joint spin-lattice rotations. Below the Lifshitz filling level, the gap is nodeless, and the superconducting state is weak topological. Above the Lifshitz points, the gap becomes nodal. The superconducting pairing and the time-reversal symmetry result from the strong spin-orbital coupling and the ferromagneticlike spin fluctuations. The dx2−y2*-wave gap structure follows from the coexisting antiferromagnetic spin fluctuations. The relevance to experiments is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi4O4S3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
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