PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
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 1.5 %. The material superconducts for x > 0.3 %, with a maximum Tc of 1.5 K for the highest Tl concentrations. All superconducting samples exhibit an anomalous resistivity upturn at low temperatures, whereas non-superconducting samples (x < 0.3%) do not. The temperature and field dependence of this resistivity 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.
I. R. Fisher,Y. Matsushita,H. Bluhm, andT. H. Geballe
"Evidence for charge Kondo effect in superconducting Tl-doped PbTe", Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 59321Y (30 August 2005); https://doi.org/10.1117/12.620179
ACCESS THE FULL ARTICLE
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
The alert did not successfully save. Please try again later.
I. R. Fisher, Y. Matsushita, H. Bluhm, T. H. Geballe, "Evidence for charge Kondo effect in superconducting Tl-doped PbTe," Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 59321Y (30 August 2005); https://doi.org/10.1117/12.620179