Evidence for Charge Kondo Effect in Superconducting Tl-Doped PbTe | Zendy

Yuichiro Matsushita | Zendy; Hendrik Bluhm | Zendy; T. H. Geballe | Zendy; I. R. Fisher | Zendy

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Evidence for Charge Kondo Effect in Superconducting Tl-Doped PbTe

Author(s) -

Yuichiro Matsushita,

Hendrik Bluhm,

T. H. Geballe,

I. R. Fisher

Publication year - 2005

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.94.157002

Subject(s) - condensed matter physics , superconductivity , kondo effect , pairing , electrical resistivity and conductivity , valence (chemistry) , doping , degenerate energy levels , materials science , electron , charge (physics) , kondo insulator , physics , quantum mechanics

We report results of low-temperature thermodynamic and transport measurementsof Pb_{1-x}Tl_{x}Te single crystals for Tl concentrations up to the solubilitylimit of approximately x = 1.5%. For all doped samples, we observe alow-temperature resistivity upturn that scales in magnitude with the Tlconcentration. The temperature and field dependence of this upturn areconsistent with a charge Kondo effect involving degenerate Tl valence statesdiffering by two electrons, with a characteristic Kondo temperature T_K ~ 6 K.The observation of such an effect supports an electronic pairing mechanism forsuperconductivity in this material and may account for the anomalously high T_cvalues.Comment: 3 figures, 4 page

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