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

Abstract

The thermal conductivity $\hat{I}º$ of superconductor Ir${}_{1-x}$Pt${}_x$Te${}_2$ ($x$ = 0.05) single crystal with strong spin-orbital coupling was measured down to 50 mK. The residual linear term $\hat{I}{º}_0/T$ is negligible in zero magnetic field. In low magnetic field, $\hat{I}{º}_0/T$ shows a slow field dependence. These results demonstrate that the superconducting gap of Ir${}_{1-x}$Pt${}_x$Te${}_2$ is nodeless, and the pairing symmetry is likely conventional s-wave, despite the existence of strong spin-orbital coupling and a quantum critical point.

5 pages, 4 figures