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Proceedings Paper

Evidence for charge Kondo effect in superconducting Tl-doped PbTe
Author(s): I. R. Fisher; Y. Matsushita; H. Bluhm; T. H. Geballe
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Paper 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 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.

Paper Details

Date Published: 30 August 2005
PDF: 9 pages
Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 59321Y (30 August 2005); doi: 10.1117/12.620179
Show Author Affiliations
I. R. Fisher, Stanford Univ. (United States)
Y. Matsushita, Stanford Univ. (United States)
H. Bluhm, Stanford Univ. (United States)
T. H. Geballe, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 5932:
Strongly Correlated Electron Materials: Physics and Nanoengineering
Ivan Bozovic; Davor Pavuna, Editor(s)

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