Detailed magneto-heat capacity analysis of SnAs topological superconductor

TL;DR

This study provides a comprehensive magneto-heat capacity analysis of SnAs, confirming its fully gapped s-wave superconductivity with a critical temperature around 4K and robustness up to 250Oe.

Contribution

The paper offers the first detailed magneto-heat capacity characterization of SnAs, establishing its fully gapped s-wave superconducting nature and field-dependent properties.

Findings

Superconductivity in SnAs at ~4K persists up to 250Oe.

SnAs is confirmed as a fully gapped s-wave superconductor.

Field-dependent residual Sommerfeld coefficient indicates node-less superconductivity.

Abstract

In this article, we report magneto-heat capacity analysis of superconducting SnAs, which is characterized through X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and magneto-transport measurements. The studied SnAs superconductor evidenced the presence of superconductivity at around 4K, and the same is seen to persist up to an applied field of 250Oe. The bulk nature of superconductivity is determined through AC susceptibility along with heat capacity measurements. Magneto-heat capacity measurements show SnAs to be a fully gapped s wave superconductor. This finding is well supported by calculated superconducting physical parameters. Further, the calculation of the residual Sommerfeld coefficient at different fields confirms node-less superconductivity in SnAs.