Detailed magneto heat capacity analysis of SnAs topological superconductor

Abstract In this article, we report magneto heat capacity analysis of superconducting SnAs. Magneto heat capacity analysis of superconductors is an important tool to determine bulk superconductivity as well as the pairing mechanism of Cooper pairs. SnAs crystal is characterized through x-ray diffraction and x-ray photoelectron spectroscopy. Magneto transport measurements of studied SnAs superconductor evidenced presence of superconductivity at around 4 K, which persists up to an applied field of 250 Oe. The bulk nature of superconductivity is determined through AC susceptibility ( χ ) along with the heat capacity measurements. Magneto heat capacity measurements show SnAs to be a fully gapped s wave superconductor. This finding is well supported by calculated physical parameters like α (3.36), λ e–ph (0.70) and Δ C el / γT c (1.41). Calculation of residual Sommerfeld coefficient ( γ res ) at different fields, confirms node-less superconductivity in SnAs.