Orbital coupling and superconductivity in the iron pnictides

Junhua Zhang, Rastko Sknepnek, Rafael M. Fernandes, Jörg Schmalian

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57 Scopus citations

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.

Original languageEnglish (US)
Article number220502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number22
DOIs
StatePublished - Jun 4 2009

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