Orbital coupling and superconductivity in the iron pnictides

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

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    57 Citations (Scopus)

    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 T(c) we determine the superconducting order parameter as function of intra- and interorbital couplings. We find an s(+/-)-pairing state with T(c)similar or equal to 80 K for realistic parameters.

    Original languageEnglish
    Article numberARTN 220502
    Number of pages4
    JournalPhysical Review B: Condensed Matter and Materials Physics
    Volume79
    Issue number22
    DOIs
    Publication statusPublished - Jun 2009

    Keywords

    • SYSTEMS
    • fluctuations
    • superconducting materials
    • SCF calculations
    • antiferromagnetism
    • iron compounds
    • surface states
    • Fermi surface
    • 2-DIMENSIONAL HUBBARD-MODEL

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