Strong-Coupling Spin-Singlet Superconductivity with Multiple Full Gaps in Hole-Doped Ba<SUB>0.6</SUB>K<SUB>0.4</SUB>Fe<SUB>2</SUB>As<SUB>2</SUB> Probed by <SUP>57</SUP>Fe-NMR

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  • Yashima Mitsuharu
    Graduate School of Engineering Science, Osaka University JST, TRIP (Transformative Research-Project on Iron Pnictides)
  • Nishimura Hideaki
    Graduate School of Engineering Science, Osaka University
  • Mukuda Hidekazu
    Graduate School of Engineering Science, Osaka University JST, TRIP (Transformative Research-Project on Iron Pnictides)
  • Kitaoka Yoshio
    Graduate School of Engineering Science, Osaka University
  • Miyazawa Kiichi
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Shirage Parasharam M.
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Kihou Kunihiro
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Kito Hijiri
    National Institute of Advanced Industrial Science and Technology (AIST) JST, TRIP (Transformative Research-Project on Iron Pnictides)
  • Eisaki Hiroshi
    National Institute of Advanced Industrial Science and Technology (AIST) JST, TRIP (Transformative Research-Project on Iron Pnictides)
  • Iyo Akira
    National Institute of Advanced Industrial Science and Technology (AIST) JST, TRIP (Transformative Research-Project on Iron Pnictides)

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  • Strong-coupling spin-singlet superconductivity with multiple full gaps in hole-doped Ba0.6K0.4Fe2As2 probed by 57Fe-NMR

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Abstract

We present 57Fe-NMR measurements of the novel normal and superconducting-state characteristics of the iron-arsenide superconductor Ba0.6K0.4Fe2As2 (Tc=38 K). In the normal state, the measured Knight shift and nuclear spin-lattice relaxation rate (1⁄T1) demonstrate the development of wave-number (q)-dependent spin fluctuations, except at q=0, which may originate from the nesting across the disconnected Fermi surfaces. In the superconducting state, the spin component in the 57Fe-Knight shift decreases to almost zero at low temperatures, evidencing a spin-singlet superconducting state. The 57Fe-1⁄T1 results are totally consistent with a s±-wave model with multiple full gaps in the strong coupling regime. We demonstrate that the respective 1⁄T1 data for Ba0.6K0.4Fe2As2 and LaFeAsO0.7, which seemingly follow a T5- and a T3-like behaviors below Tc, are consistently explained in terms of this model only by changing the size of the superconducting gap.

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