Evidence for Charge Kondo Effect in Superconducting Tl-Doped PbTe
Y. Matsushita, H. Bluhm, T. H. Geballe, I. R. Fisher
DOI 10.1103/PhysRevLett.94.157002 · Physical Review Letters
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Abstract
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 x=1.5%. For all doped samples, we observe a low-temperature resistivity upturn that scales in magnitude with the Tl concentration. The temperature and field dependence of this 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb1-xTlxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure not reported | midpoint |
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