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Evidence for charge Kondo effect in superconducting Tl-doped PbTe.
MedLine Citation:
PMID:  15904175     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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) approximately 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.
Authors:
Y Matsushita; H Bluhm; T H Geballe; I R Fisher
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Publication Detail:
Type:  Journal Article     Date:  2005-04-21
Journal Detail:
Title:  Physical review letters     Volume:  94     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-05-20     Completed Date:  2005-06-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  157002     Citation Subset:  -    
Affiliation:
Department of Materials Science and Engineering and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305-4045, USA.
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