Evidence for charge Kondo effect in superconducting Tl-doped PbTe

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We report results of low-temperature thermodynamic and transport measurements of Pb{sub 1-x}Tl{sub x}Te 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{sub K} {approx} 6 K. The observation of such an effect supports an electronic pairing mechanism for superconductivity in this material and may account for ... continued below

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Fisher, I January 11, 2010.

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We report results of low-temperature thermodynamic and transport measurements of Pb{sub 1-x}Tl{sub x}Te 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{sub K} {approx} 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{sub c} values.

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  • Journal Name: Physical Review Letters

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  • Report No.: SLAC-PUB-13857
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 970453
  • Archival Resource Key: ark:/67531/metadc935240

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  • January 11, 2010

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 15, 2016, 3:23 p.m.

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Fisher, I. Evidence for charge Kondo effect in superconducting Tl-doped PbTe, article, January 11, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc935240/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.