RPA analysis of a two-orbital model for the BiS2-based superconductors
G. B. Martins, A. Moreo, E. Dagotto
DOI 10.1103/PhysRevB.87.081102 · Physical Review B
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Abstract
The random-phase approximation (RPA) is here applied to a two-orbital model for the BiS2-based superconductors that was recently proposed by Usui et al. [Phys. Rev. B 86, 220501(R) (2012)]. Varying the density of doped electrons per Bi site n in the range 0.46≤n≤1.0, the spin fluctuations promote competing A1g and B2g superconducting states with similar pairing strengths, in analogy with the A1g-B1g near degeneracy found also within RPA in models for pnictides. At these band fillings, two hole pockets centered at (0,0) and (π,π) display nearly parallel Fermi-surface segments close to wave vector (π/2,π/2), whose distance increases with n. After introducing electronic interactions treated in the RPA, the interpocket nesting of these segments leads to pair scattering with a rather “local” character in k space. The similarity between the A1g and B2g channels observed here should manifest in experiments on BiS2-based superconductors if the pairing is caused by spin fluctuations.
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 |
| 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 |
| CeO1-xFxBiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
| PrO1-xFxBiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.5 | Pressure not reported | unknown |
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