FERROMAGNETIC SPIN FLUCTUATION-INDUCED SUPERCONDUCTIVITY IN SR2RUO4

We propose a quantitative model for triplet superconductivity in Sr2Ru O4 based on first principles calculations for the electronic structure and magnetic susceptibility. The superconductivity is due to ferromag netic spin fluctuations that are strong at small wave vectors. The cal culated effective mass renormalization, renormalized susceptibility, a nd superconducting critical temperature are all in good agreement with experiment. The order parameter is of comparable magnitude on all thr ee sheets of the Fermi surface.