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We grew the single crystals of the SnAs-based van der Waals (vdW)-typesuperconductor NaSn$_2$As$_2$ and systematically measured its resistivity,specific heat, and ultralow-temperature thermal conductivity. Thesuperconducting transition temperature $T_c$ = 1.60 K of our single crystal is0.3 K higher than that previously reported. A weak but intrinsic anomalysituated at 193 K is observed in both resistivity and specific heat, whichlikely arises from a charge-density-wave (CDW) instability.Ultralow-temperature thermal conductivity measurements reveal a fully-gappedsuperconducting state with a negligible residual linear term in zero magneticfield, and the field dependence of $\kappa_0 / T$ further suggestsNaSn$_2$As$_2$ is an $s$-wave superconductor.

Nodeless superconductivity in the SnAs-based van der Waals type superconductor NaSn2As2