Extended Hubbard model of superconductivity driven by charge fluctuations in iron pnictides
Sen Zhou, G. Kotliar, Ziqiang Wang
DOI 10.1103/PhysRevB.84.140505 · Physical Review B
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Abstract
We present a scenario for iron-pnictide superconductivity mediated by charge fluctuations that are strongly enhanced by Fe-As intersite electronic interactions. Deriving an eight-band extended Hubbard model including Fe 3d and As 4p orbitals for the LaOFeAs family, we show that charge fluctuations induced by p-d charge transfer and As orbital polarization interactions in the Fe-pnictogen structure peak at wave vectors (0,0), and (π,0) and (π,π), respectively. Intraorbital spin-singlet pairing attraction develops at these wave vectors and the solution of the linearized gap equation shows robust s-wave superconductivity with both s± and s++ gap functions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| KxBa1-xFe2As2 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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