Effect of Indium on the Superconducting Transition Temperature of Tin Telluride

Indium-doped tin telluride is one of the most appealing topological superconductors. We have grown a series of Sn$_{\mathrm{1-x}}$In$_{\mathrm{x}}$Te crystals with different indium concentrations (0.1$\le $x$\le $1.0). The results show indium doping improves the superconducting transition temperature significantly and is highly related to the indium concentration. The maximum Tc of indium-doped tin telluride polycrystalline is 4.5K for x$=$0.4. Single crystals of Sn$_{\mathrm{1-x}}$In$_{\mathrm{x}}$Te were also grown by the floating zone method, and their magnetic properties were characterized.