Orbital-fluctuation-mediated superconductivity in iron pnictides: Analysis of the five-orbital hubbard-holstein model

Hiroshi Kontani, Seiichiro Onari

    Research output: Contribution to journalArticlepeer-review

    531 Citations (Scopus)

    Abstract

    In iron pnictides, we find that the moderate electron-phonon interaction due to the Fe-ion oscillation can induce the critical d-orbital fluctuations, without being prohibited by the Coulomb interaction. These fluctuations give rise to the strong pairing interaction for the s-wave superconducting (SC) state without sign reversal (s++-wave state), which is consistent with experimentally observed robustness of superconductivity against impurities. When the magnetic fluctuations due to Coulomb interaction are also strong, the SC state shows a smooth crossover from the s-wave state with sign reversal (s±-wave state) to the s++-wave state as impurity concentration increases.

    Original languageEnglish
    Article number157001
    JournalPhysical Review Letters
    Volume104
    Issue number15
    DOIs
    Publication statusPublished - Apr 15 2010

    ASJC Scopus subject areas

    • General Physics and Astronomy

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