Coherence effect in a two-band superconductor: Application to iron pnictides

Keisuke Masuda, Susumu Kurihara

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    From a theoretical point of view, we propose an experimental method to determine the pairing symmetry of iron pnictides. We focus on two kinds of pairing symmetries, s+- and s++, which are strong candidates for the pairing symmetry of iron pnictides. For each of these two symmetries, we calculate both the density and spin response functions by using the two-band BCS model within the one-loop approximation. As a result, a clear difference is found between the s+- and s++-wave states in the temperature dependence of the response functions at nesting vector Q, which connects the hole and electron Fermi surfaces. We point out that this difference comes from the coherence effect in the twoband superconductor. We suggest that the pairing symmetry could be clarified by observing the temperature dependence of both the density and spin structure factors at the nesting vector Q in neutron scattering measurements.

    Original languageEnglish
    Article number074710
    JournalJournal of the Physical Society of Japan
    Volume79
    Issue number7
    DOIs
    Publication statusPublished - 2010 Jul

    Keywords

    • Coherence effect
    • Iron-pnictide superconductors
    • Pairing symmetry
    • Response functions
    • Two-band BCS model

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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