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We report comprehensive study of physical properties of the binarysuperconductor compound SnAs. The electronic band structure of SnAs wasinvestigated using both angle-resolved photoemission spectroscopy (ARPES) in awide binding energy range and density functional theory (DFT) withingeneralized gradient approximation (GGA). The DFT/GGA calculations were doneincluding spin-orbit coupling for both bulk and (111) slab crystal structures.Comparison of the DFT/GGA band dispersions with ARPES data shows that (111)slab much better describes ARPES data than just bulk bands. Superconductingproperties of SnAs were studied experimentally by specific heat, magneticsusceptibility, magnetotransport measurements and Andreev reflectionspectroscopy. Temperature dependences of the superconducting gap and of thespecific heat were found to be well consistent with those expected for thesingle band BCS superconductors with an isotropic s-wave order parameter.Despite spin-orbit coupling is present in SnAs, our data shows no signatures ofa potential unconventional superconductivity, and the characteristic BCS ratio$2\Delta/T_c = 3.48 - 3.73$ is very close to the BCS value in the weak couplinglimit.

Electronic Band Structure and Superconducting Properties of SnAs