RENORMALIZATION-GROUP APPROACH TO THE COULOMB PSEUDOPOTENTIAL FOR C-60

A numerical renormalization-group technique recently developed by one of us is used to analyze the Coulomb pseudopotential (mu*) in C-60 for a variety of short-range bare potentials. We find a large reduction in mu* due to intraball screening alone, leading to an interesting no-monotonic dependence of mu* On the bare interaction strength. We find that mu* is positive for physically reasonable bare parameters, but small enough to make the electron-phonon coupling a viable mechanism for superconductivity in alkali-doped fullerides. We end with some open problems.