Modified pairing structure due to momentum-dependent correlations in iron-based superconductors

ORAL

Abstract

We discuss the influence of momentum-dependent correlation effects arising from particle-hole interactions on the superconducting gap structure of iron-based superconductors. Within the Eliashberg formalism, we obtain a modified linearized gap equation arising from the spin-fluctuation interaction in the weak-coupling regime which includes self-consistent renormalizations of quasiparticle weights. The modification of the particle-particle interaction vertex by particle-hole processes modifies the superconducting gap structure, i.e. momentum-dependent enhancement or suppression of gap amplitude compared to traditional spin-fluctuation pairing calculations. We obtain good agreement with experimentally observed anisotropic gap structures in LiFeAs, indicating that inclusion of non-local correlation effects in the existing weak-coupling theories can account for observed signatures of the correlated iron-based superconductors.

*Shinibali Bhattacharyya acknowledges support in part through an appointment to the Oak Ridge National Laboratory ASTRO Program, sponsored by the U.S. Department of Energy and administered by the Oak Ridge Institute for Science and Education.

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Presenters

  • Shinibali Bhattacharyya

    • University of Florida

Authors

  • Shinibali Bhattacharyya

    • University of Florida

  • Peter Hirschfeld

    • University of Florida
    • Department of Physics, University of Florida

  • Thomas Maier

    • Computational Sciences and Engineering Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Center for Nanophase Materials Sciences,Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA and Computational Sciences and Engineering Division, Oak Ridge Nat
    • Computational Sciences and Engineering Division, Oak Ridge National Laboratory

  • Douglas J Scalapino

    • University of California, Santa Barbara