Anomalous scattering in superconducting indium-doped tin telluride

Results of resistivity, Hall effect, magnetoresistance, susceptibility and heat capacity measurements are presented for single crystals of indium-doped tin telluride with compositions Sn$_{.988-x}$In$_x$Te where $0 \leq x \leq 8.4$, along with microstructural analysis based on transmission electron microscopy. For small indium concentrations, $x \leq 0.9$ the material does not superconduct above 0.3 K, and the transport properties are consistent with simple metallic behavior. For $x \geq 2.7$ the material exhibits anomalous low temperature scattering and for $x \geq 6.1$ bulk superconductivity is observed with critical temperatures close to 2 K. Intermediate indium concentrations $2.7$ do not exhibit bulk superconductivity above 0.7 K. Susceptibility data indicate the absence of magnetic impurities, while magnetoresistance data are inconsistent with localization effects, leading to the conclusion that indium-doped SnTe is a candidate charge Kondo system, similar to thallium-doped PbTe.

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