Possible sign-reversing s-wave superconductivity in Co-doped BaFe2As2 proved by thermal transport measurements

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  • Machida Yo
    Department of Physics, Tokyo Institute of Technology
  • Tomokuni Kosuke
    Department of Physics, Tokyo Institute of Technology
  • Isono Takayuki
    Department of Physics, Tokyo Institute of Technology
  • Izawa Koichi
    Department of Physics, Tokyo Institute of Technology
  • Nakajima Yasuyuki
    Department of Applied Physics, The University of Tokyo JST, Transformative Research-Project on Iron Pnictides (TRIP)
  • Tamegai Tsuyoshi
    Department of Applied Physics, The University of Tokyo JST, Transformative Research-Project on Iron Pnictides (TRIP)

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  • Possible Sign-Reversing <I>s</I>-Wave Superconductivity in Co-Doped BaFe<SUB>2</SUB>As<SUB>2</SUB> Proved by Thermal Transport Measurements

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Thermal transport measurements have been performed on single-crystalline Co-doped BaFe2As2 down to 0.1 K and under magnetic fields up to 7 T. Significant peak anomalies are observed in both thermal conductivity and thermal Hall conductivity below Tc as an indication of the enhancement of the quasiparticle mean-free path. Moreover, we find a sizable residual T-linear term in thermal conductivity, possibly due to a finite quasiparticle density of states in the superconducting gap induced by impurity pair breaking. Our findings support a pairing symmetry compatible with the theoretically predicted sign-reversing s-wave state.

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