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The thermal conductivity of the doped topological crystalline insulator,Sn$_{0.6}$In$_{0.4}$Te superconducting single crystal with $T_c =$ 4.1 K, wasmeasured down to 50 mK. It is found that the residual linear term $\kappa_0/T$is negligible in zero magnetic field. The $\kappa_0/T$ shows a slow fielddependence at low magnetic field. These results suggest that thesuperconducting gap is nodeless, unless there exist point nodes with directionsperpendicular to the heat current. Due to its high-symmetry fcc crystalstructure of Sn$_{0.6}$In$_{0.4}$Te, however, such point nodes can be excluded.Therefore we demonstrate that this topological superconductor candidate has afull superconducting gap in the bulk. It is likely the unconventionalodd-parity $A_{1u}$ state which supports a surface Andreev bound state.

Full superconducting gap in the doped topological crystalline insulator, Sn$_{0.6}$In$_{0.4}$Te