title: Superconductivity in charge Kondo systems.
abstract: We present a theory for superconductivity and charge Kondo fluctuations, i.e., resonant quantum valence fluctuations by two charge units, for Tl-doped PbTe. We show that Tl is very special as it first supplies a certain amount of charge carriers to the PbTe-valence band and then puts itself into a self-tuned resonant state to yield a new, robust pairing mechanism for these carriers.
authors.affiliation: Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: Maxim
authors.initials: M
authors.lastname: Dzero
authors.forename: Jörg
authors.initials: J
authors.lastname: Schmalian