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30 August 2005 Evidence for charge Kondo effect in superconducting Tl-doped PbTe
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We report results of low temperature thermodynamic and transport measurements of Pb1-xTlxTe single crystals for Tl concentrations up to the solubility limit of approximately 1.5 %. The material superconducts for x > 0.3 %, with a maximum Tc of 1.5 K for the highest Tl concentrations. All superconducting samples exhibit an anomalous resistivity upturn at low temperatures, whereas non-superconducting samples (x < 0.3%) do not. The temperature and field dependence of this resistivity upturn are consistent with a charge Kondo effect involving degenerate Tl valence states differing by two electrons, with a characteristic Kondo temperature TK ~ 6 K. The observation of such an effect supports an electronic pairing mechanism for superconductivity in this material and may account for the anomalously high Tc values.
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I. R. Fisher, Y. Matsushita, H. Bluhm, and T. H. Geballe "Evidence for charge Kondo effect in superconducting Tl-doped PbTe", Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 59321Y (30 August 2005);

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