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

E. J. Cheng, J. M. Ni, F. Q. Meng +6

We grew the single crystals of the SnAs-based van der Waals (vdW)-type superconductor NaSn${}_2$As${}_2$ and systematically measured its resistivity, specific heat, and ultralow-temper…