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We investigate the properties of PbTe doped with a small concentration $x$ ofTl impurities acting as acceptors and described by Anderson impurities withnegative onsite correlation energy. We use the numerical renormalization groupmethod to show that the resulting charge Kondo effect naturally accounts forthe unusual low temperature and doping dependence of normal state properties,including the self-compensation effect in the carrier density and thenon-magnetic Kondo anomaly in the resistivity. These are found to be in goodqualitative agreement with experiment. Our results for the Tl s-electronspectral function provide a new interpretation of point contact data.

Charge Kondo anomalies in PbTe doped with Tl impurities