Minimal electronic models for superconducting BiS2 layers
Hidetomo Usui, Katsuhiro Suzuki, Kazuhiko Kuroki
DOI 10.1103/PhysRevB.86.220501 · Physical Review B
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Abstract
We construct minimal electronic models for a newly discovered superconductor LaO1−xFxBiS2 (Tc=10.6 K) possessing BiS2 layers based on a first-principles band calculation. First, we obtain a model consisting of two Bi 6p and two S 3p orbitals, which give nearly electron-hole symmetric bands. Further focusing on the bands that intersect the Fermi level, we obtain a model with two p orbitals. The two bands (per BiS2 layer) have a quasi-one-dimensional character with a double minimum dispersion, which gives good nesting of the Fermi surface. At around x∼0.5 the topology of the Fermi surface changes, so that the density of states at the Fermi level becomes large. Possible pairing states are 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. | 8.6 | Pressure not reported | unknown |
| LaO1-xFxBiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.6 | Pressure not reported | unknown |
| NdO1-xFxBiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.6 | Pressure not reported | unknown |
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