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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Author(s)

    • Machida Yo
    • 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)

Abstract

Thermal transport measurements have been performed on single-crystalline Co-doped BaFe<SUB>2</SUB>As<SUB>2</SUB> 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 <I>T</I><SUB>c</SUB> as an indication of the enhancement of the quasiparticle mean-free path. Moreover, we find a sizable residual <I>T</I>-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 <I>s</I>-wave state.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 78(7), 073705-073705, 2009

    THE PHYSICAL SOCIETY OF JAPAN

Codes

  • NII Article ID (NAID)
    130005437488
  • Text Lang
    ENG
  • ISSN
    0031-9015
  • Data Source
    J-STAGE 
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