Evidence for charge Kondo effect in superconducting Tl-doped PbTe

被引：123

作者：

Matsushita, Y ^{[1
]}

Bluhm, H

Geballe, TH

Fisher, IR

机构：

[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[2] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[3] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[4] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.94.157002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 T(K)similar to 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.

引用

页数：4

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