Spin fluctuation mediated extended s-wave pairing from multiple Fermi surfaces in iron pnictide superconductors

ORAL

Abstract

For the superconducting iron pnictides, we have constructed a minimal model, where all the five Fe d bands turn out to be involved[1]. The model is used to investigate the origin of superconductivity with a five-band random-phase approximation for solving the Eliashberg equation. We conclude that the spin fluctuation modes arising from the nesting between the disconnected Fermi pockets realize basically an extended s-wave pairing, but that the gap function is in fact a matrix with significant off-diagonal elements. [1] K. Kuroki, S. Onari, R. Arita, H. Usui, Y. Tanaka, H. Kontani, and H. Aoki, Phys. Rev. Lett. \textbf{101}, 087004 (2008).

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Authors

  • Kazuhiko Kuroki

    Department of Applied Physics and Chemistry, The University of Electro-Communications and JST, TRIP

  • Seiichiro Onari

    Department of Applied Physics, Nagoya University and JST, TRIP, Department of Applied Physics, Nagoya University

  • Ryotaro Arita

    Department of Applied Physics, University of Tokyo and JST, TRIP

  • Hidetomo Usui

    Department of Applied Physics and Chemistry, The University of Electro-Communications and JST, TRIP

  • Yukio Tanaka

    Department of Applied Physics, Nagoya University and JST, TRIP, Department of Applied Physics, Nagoya University, Department of Applied Physics, Nagoya University,Japan

  • H. Kontani

    Department of Physics, Nagoya University and JST, TRIP, Nagoya University

  • Hideo Aoki

    Department of Physics, University of Tokyo and JST, TRIP