title: Unconventional superconductivity from local spin fluctuations in the Kondo lattice.
abstract: The explanation of heavy-fermion superconductivity is a long-standing challenge to theory. It is commonly thought to be connected to nonlocal fluctuations of either spin or charge degrees of freedom and therefore of unconventional type. Here we present results for the Kondo-lattice model, a paradigmatic model to describe heavy-fermion compounds, obtained from dynamical mean-field theory which captures local correlation effects only. Unexpectedly, we find robust s-wave superconductivity in the heavy-fermion state. We argue that this novel type of pairing is tightly connected to the formation of heavy quasiparticle bands and the presence of strong local spin fluctuations.
authors.affiliation: Institut für Theoretische Physik, Universität Göttingen, 37077 Göttingen, Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Bodensiek
authors.affiliation: Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
authors.forename: Rok
authors.initials: R
authors.lastname: Žitko
authors.affiliation: Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Vojta
authors.affiliation: Louisiana State University, Baton Rouge, Louisiana 70803, USA.
authors.forename: Mark
authors.initials: M
authors.lastname: Jarrell
authors.affiliation: Institut für Theoretische Physik, Universität Göttingen, 37077 Göttingen, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Pruschke