Nuclear magnetic relaxation and superfluid density in Fe-pnictide superconductors: An anisotropic \pm s-wave scenario

Authors:
  • YNYuki Nagai
    Yuki Nagai
  • NHNobuhiko Hayashi
    Nobuhiko Hayashi
  • NNNoriyuki Nakai
    Noriyuki Nakai
  • HNHiroki Nakamura
    Hiroki Nakamura
  • MOMasahiko Okumura
    Masahiko Okumura
  • MMMasahiko Machida
    Masahiko Machida
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Abstract
We discuss the nuclear magnetic relaxation rate and the superfluid density with the use of the effective five-band model by Kuroki et al. [Phys. Rev. Lett. 101, 087004 (2008)] in Fe-based superconductors. We show that a fully-gapped anisotropic \pm s-wave superconductivity consistently explains experimental observations. In our phenomenological model, the gaps are assumed to be anisotropic on the electron-like \beta Fermi surfaces around the M point, where the maximum of the anisotropic gap is about four times larger than the minimum.