Renormalization group analysis for the quasi-one-dimensional superconductor BaFe2S3
Elio J. König, Alexei M. Tsvelik, Piers Coleman
DOI 10.1103/PhysRevB.98.184517 · Physical Review B
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Abstract
Motivated by the discovery of superconductivity in the two-leg, quasi-one-dimensional ladder compound BaFe2S3, we present a renormalization group study of electrons moving on a two-leg, two-orbital ladder, subjected to Hubbard repulsion U and Hund's coupling J. In our calculations, we adopt tight-binding parameters obtained from ab initio studies on this material. At incommensurate filling, the long-wavelength analysis displays four phases as a function of 0≤J/U<1. We show that a fully gapped superconductor is stabilized at sufficiently large Hund's coupling, the relative phases at the three Fermi points are “+,−,−”. By contrast, when the system is tuned to half-filling, umklapp scattering gives rise to Mott insulating phases. We discuss the general implications of our study for the broad class of iron-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2S3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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