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Strong Coupling Theory for Superconducting Iron Pnictides

Wei-Qiang Chen, Kai-Yu Yang, Yi Zhou, Fu-Chun Zhang
2009 Physical Review Letters  

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2008 pre-print arXiv:0808.3234v1 fatcat:jhwrx3uexzfzzcdzswzvsiwc6a

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2008 accepted
arXiv:0808.3234v2 fatcat:ryrm3vrk3baibadqjuzeg6da5u
Superconductivity in iron pnictides is studied by using a two-orbital Hubbard model in the large U limit. The Coulomb repulsion induces an orbital-dependent pairing between charge carriers. The pairing is found mainly from the scattering within the same Fermi pocket. The inter-pocket pair scatterings determine the symmetry of the superconductivity, which is extended s-wave at small Hund's coupling, and d-wave at large Hund's coupling and large U. The former is consistent with recent experiments of ARPES and Andreev reflection spectroscope.
doi:10.1103/physrevlett.102.047006 pmid:19257468 fatcat:z6lgymupyzcf3d7snto56k5d5e
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Wei-Qiang Chen, Kai-Yu Yang, Yi Zhou, Fu-Chun Zhang. "Strong Coupling Theory for Superconducting Iron Pnictides." Physical Review Letters 102.4 (2009)