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

TL;DR

This study investigates the thermal conductivity of Ir$_{1-x}$Pt$_{x}$Te$_2$ revealing a nodeless superconducting gap and likely conventional s-wave pairing, even with strong spin-orbital coupling.

Contribution

It provides experimental evidence for nodeless superconductivity in Ir$_{1-x}$Pt$_{x}$Te$_2$ with strong spin-orbital coupling, highlighting its conventional pairing symmetry.

Findings

Residual linear term $/T$ is negligible at zero field.

$/T$ shows slow field dependence in low magnetic fields.

Superconducting gap is nodeless and likely s-wave.

Abstract

The thermal conductivity $\kappa$ 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 $\kappa_0/T$ is negligible in zero magnetic field. In low magnetic field, $\kappa_0/T$ 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.