Evidence for a charge Kondo effect in Pb<inf>1-x</inf> Tl<inf>x</inf> Te from measurements of thermoelectric power
Matusiak M., Tunnicliffe EM., Cooper JR., Matsushita Y., Fisher IR.
We report measurements of the thermoelectric power (TEP) for a series of Pb 1-x Tl x Te crystals with x=0.0 to 1.3%. Although the TEP is very large for x=0.0, using a single-band analysis based on older work for dilute magnetic alloys we do find evidence for a Kondo contribution of 11-18 μV/K. This analysis suggests that TK is 50-70 K, a factor 10 higher than previously thought. © 2009 The American Physical Society.