2004/09/30 by Y. Matsushita, Yu‐ichiro Matsushita, Hendrik Bluhm +3 · 2 citations
Materials Science · Physics and Astronomy · #Charge (physics) #Condensed matter physics #Degenerate energy levels #Doping #Electrical resistivity and conductivity #Electron #Kondo effect #Kondo insulator #Magnetic and transport properties of perovskites and related materials #Materials science #Pairing #Physics #Rare-earth and actinide compounds #Superconductivity #Topological Materials and Phenomena #Valence (chemistry) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.94.157002
3 figures, 4 pages
arxiv created 2005/02/08 · openalex publication_date 2005/04/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.