corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 94 » Issue 15
< Previous Article | Next Article >

Phys. Rev. Lett. 94, 157002 (2005) [4 pages]

Evidence for Charge Kondo Effect in Superconducting Tl-Doped PbTe

Download: PDF (504 kB) Buy this article Export: BibTeX or EndNote (RIS)

Y. Matsushita1, H. Bluhm2, T. H. Geballe3, and I. R. Fisher3
1Department of Materials Science and Engineering and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305-4045, USA
2Department of Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305-4045, USA
3Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305-4045, USA

Received 9 September 2004; published 21 April 2005

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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.157002
DOI:
10.1103/PhysRevLett.94.157002
PACS:
74.70.Dd, 72.15.Qm
 
< Previous Article | Next Article >