Superconductivity and possible charge Kondo effect in Tl-doped PbTe
Abstract
We report results of low-temperature thermodynamic and transport measurements of single crystals of Pb_{1-x}Tl_{x}Te for Tl concentrations up to the solubility limit of approximately 1.5%. For x greater than approximately 0.3%, the samples superconduct with a maximum T_c of 1.4 K for the highest Tl concentrations. For all doped samples, we observe an anomalous low-temperature upturn in the resistivity that saturates below 1 K and that scales in magnitude with the Tl concentration. The temperature and field dependence of this upturn are consistent with Kondo-like behavior of a non-magnetic degenerate two-level system.Keywords
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