Optimizing the superconducting transition temperature and upper critical field of Sn(1-x)In(x)Te

TL;DR

This study systematically investigates Sn(1-x)In(x)Te, revealing how In substitution affects its superconducting properties, with a maximum Tc of 4.5 K at x=0.45, indicating potential for topological superconductivity.

Contribution

It provides a comprehensive experimental analysis of In doping effects on SnTe, identifying optimal compositions for superconductivity and characterizing their structural and magnetic properties.

Findings

Maximum Tc of 4.5 K at x=0.45

Superconductivity increases with In concentration

Single crystals show clear diamagnetic transition

Abstract

Sn(1-x)In(x)Te is a possible candidate for topological superconductivity. Previous work has shown that substitution of In for Sn in the topological crystalline insulator SnTe results in superconductivity, with the transition temperature, Tc, growing with In concentration. We have performed a systematic investigation of Sn(1-x)In(x)Te for a broad range of x, synthesizing single crystals (by a modified floating zone method) as well as polycrystalline samples. The samples have been characterized by x-ray diffraction, resistivity, and magnetization. For the single crystals, the maximum Tc is obtained at x=0.45 with a value of of 4.5 K, as determined by the onset of diamagnetism.