Orbital coupling and superconductivity in the iron pnictides
Junhua Zhang, Rastko Sknepnek, Rafael M. Fernandes, Jörg Schmalian
DOI 10.1103/PhysRevB.79.220502 · Physical Review B
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Abstract
We demonstrate that strong interorbital interaction is very efficient to achieve superconductivity due to magnetic fluctuations in the iron pnictides. Fermi-surface states that are coupled by the antiferromagnetic wave vector are often of different orbital nature, causing pair-hopping interactions between distinct Fe-3d orbitals to become important. Performing a self-consistent fluctuation exchange calculation below Tc we determine the superconducting order parameter as function of intra- and interorbital couplings. We find an s±-pairing state with Tc≃80 K for realistic parameters.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
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