Andreev Reflection Spectroscopy on SnAs Single Crystals

Binary compounds of SnT family (T = As, Sb, Te, S, Se, P) exhibit novel properties like superconductivity and topologically protected states. Some these crystallize in NaCl type structure or layered structure, both which are considered potentially important for high temperature/unconventional superconductivity. It was previously shown that K-doped BaBiO3 with exhibits superconducting state below ∼30 K. SnAs has crystallographic configuration is exactly similar to this warrants the investigation material. Previously it reported weakly coupled I an energy gap 0.7 meV. Recently, electronic band-structure calculations have hinted existence possible states SnAs. This motivated us investigate nature using point contact Andreev reflection spectroscopy. Our revealed can be well-explained within BCS framework weak coupling limit.