Optimizing the superconducting transition temperature and upper critical field of Sn1−xInxTe

Abstract

Sn${}_{1\ensuremath{-}x}$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, ${T}_{c}$, growing with In concentration. We have performed a systematic investigation of Sn${}_{1\ensuremath{-}x}$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 ${T}_{c}$ is obtained at $x=0.45$ with a value of 4.5 K, as determined by the onset of diamagnetism.