Evidence for charge Kondo effect in superconducting Tl-doped PbTe

I. R. Fisher; Y. Matsushita; H. Bluhm; T. H. Geballe

doi:10.1117/12.620179

30 August 2005 Evidence for charge Kondo effect in superconducting Tl-doped PbTe

I. R. Fisher, Y. Matsushita, H. Bluhm, T. H. Geballe

Proceedings Volume 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering; 59321Y (2005) https://doi.org/10.1117/12.620179
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

We report results of low temperature thermodynamic and transport measurements of Pb_1-xTl_xTe single crystals for Tl concentrations up to the solubility limit of approximately 1.5 %. The material superconducts for x > 0.3 %, with a maximum T_c 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 T_K ~ 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 T_c values.

Citation Download Citation

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); https://doi.org/10.1117/12.620179

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