1209.4229 (S. Y. Zhou et al.)

Nodeless superconductivity in Ir$_{1-x}$Pt$_x$Te$_2$ with strong
spin-orbital coupling    [PDF]

S. Y. Zhou, B. Y. Pan, X. Qiu, J. Pan, X. C. Hong, X. L. Li, Z. Zhang, J. J. Yang, Y. S. Oh, S-W. Cheong, S. Y. Li

The in-plane thermal conductivity $\kappa$ of the layered superconductor Ir$_{1-x}$Pt$_x$Te$_2$ singe crystal was measured down to 50 mK. In zero field, a finite residual linear term $\kappa_0/T$ is observed, which is usually considered as the signature of nodal superconducting gap. However, in magnetic field, $\kappa_0/T$ decreases first, then increases slowly with increasing field. This field dependence of $\kappa_0/T$ is inconsistent with nodal gap. We attribute the finite $\kappa_0/T$ in zero field and the decrease of $\kappa_0/T$ in low field to the nonsuperconducting impure phase in the crystal. The overall slow field dependence of $\kappa_0/T$ manifests the underlying nodeless superconducting gap in Ir$_{1-x}$Pt$_x$Te$_2$, which puts strict constrain on the pairing symmetry.

View original: http://arxiv.org/abs/1209.4229