Abstract

High-temperature superconductivity in doped Mott insulators such as the cuprates contradicts the conventional wisdom that electron repulsion is det-rimental to superconductivity. Because doped fullerene conductors are also strongly correlated, the recent discovery of high-critical-temperature, presum-ably s-wave, superconductivity in C60 field effect devices is even more puzzling. We examine a dynamical mean-field solution of a model for electron-doped fullerenes that shows how strong correlations can indeed enhance supercon-ductivity close to theMott transition.We argue that themechanism responsible for this enhancement could be common to a wider class of strongly correlated models, including those for cuprate superconductors. In conventional superconductors, the repul-sive Coulomb interaction between electrons tends to oppose phonon-mediated pairing, so that the actual critical temperature of the onset of superconductivity (Tc) decreases