Nodeless superconducting gap in the candidate topological superconductor Sn${}_{1-x}$In${}_x$Te for x = 0.7

Abstract

High-pressure synthesis techniques have allowed for the growth of Sn${}_{1-x}$In${}_x$Te samples beyond the ambient In-saturation limit of $x$ = 0.5 (T${}_c\sim$ 4.5 K). In this study, we present measurements of the temperature dependence of the London penetration depth $\Delta \lambda (T)$ in this superconducting doped topological insulator for $x$ = 0.7, where T${}_{c,onset}\approx 5$ K. The results indicate fully gapped BCS-like behavior, ruling out odd-parity $A_{2u}$ pairing; however, odd-parity $A_{1u}$ pairing is still possible. Critical field values measured below 1 K and other superconducting parameters are also presented.

5 pages, 6 figures