Possible Sign-Reversing $s$-Wave Superconductivity in Co-Doped BaFe2As2 Proved by Thermal Transport Measurements

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概要

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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 $T_{\text{c}}$ 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.

• Physical Society of Japanの論文
• 2009-07-15

著者

• Izawa Koichi

  Department Of Physics Faculty Of Faculty Of Science Hiroshima University

• Tamegai Tsuyoshi

  Department Of Applied Physics The University Of Tokyo

• Machida Yo

  Department Of Materials Science And Engineering Tokyo Institute Of Technology:(present Address)depar

• Isono Takayuki

  Department Of Physics Tokyo Institute Of Technology

• Tomokuni Kosuke

  Department Of Physics Tokyo Institute Of Technology

• Nakajima Yasuyuki

  Department Of Applied Physics The University Of Tokyo

• Tamegai Tsuyoshi

  Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656

• Machida Yo

  Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551

• Isono Takayuki

  Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551

• Izawa Koichi

  Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551

• Tomokuni Kosuke

  Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551

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