Recent evidence for a charge-Kondo effect in superconducting samples of Pb1-x Tlx Te has brought renewed attention to the possibility of negative U superconductivity in this material, associated with valence fluctuations on the Tl impurity sites. Here, we use indium as an electron donor to counterdope Pb.99 Tl.01 Te and study the effect of changing the chemical potential on the Kondo-type physics and the superconductivity. We find a clear correlation between these two effects, providing further evidence that both are induced by the same source, as anticipated in the charge-Kondo model.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Apr 23 2010|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics