Nodeless superconductivity in the noncentrosymmetric superconductor BiPd. (5th April 2016) - Yan, X B
Abstract: We report low-temperature thermal conductivity measurements on high-quality single crystalline α -BiPd, a noncentrosymmetric superconductor with T c ≃ 3.8 K. In zero magnetic field, the residual linear term κ 0 / T is absent, indicating a full gap and suggesting dominant singlet pairing. Consistent with this picture, κ 0 ( H )/ T shows weak field dependence in low field, but grows relatively fast in fields above 0.03 T (≃1/5 H c2 ). Implications for the material's disputed high-field behavior are discussed, and constraints are placed on the previously proposed scenarios.