Renormalization Group Approach to the Coulomb Pseudopotential for C_{60}

Details Renormalization Group Approach to the Coulomb Pseudopotential for C_{60} Renormalization Group Approach to the Coulomb Pseudopotential for C_{60}

1994-11-13

arxiv.org/abs/cond-mat/9411049v1

Physics

Condensed Matter

12 pages, latex, 7 figures available from murthy@buphy.bu.edu

Scientific paper

10.1103/PhysRevB.52.3083

A numerical renormalization group technique recently developed by one of us is used to analyse the Coulomb pseudopotential (${\mu^*}$) in ${{\rm C}_{60}}$ for a variety of bare potentials. We find a large reduction in ${\mu^*}$ due to intraball screening alone, leading to an interesting non-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.

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