Screening, Coulomb pseudopotential, and superconductivity in alkali-doped Fullerenes

Details Screening, Coulomb pseudopotential, and superconductivity in alkali-doped Fullerenes Screening, Coulomb pseudopotential, and superconductivity in alkali-doped Fullerenes

1999-02-17

arxiv.org/abs/cond-mat/9902241v1

Phys.Rev.Lett. 83, 620 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages RevTeX with 2 eps figures, additional material available at http://www.mpi-stuttgart.mpg.de/docs/ANDERSEN/fullerene/

Scientific paper

10.1103/PhysRevLett.83.620

We study the static screening in a Hubbard-like model using quantum Monte Carlo. We find that the random phase approximation is surprisingly accurate almost up to the Mott transition. We argue that in alkali-doped Fullerenes the Coulomb pseudopotential $\mu^\ast$ is not very much reduced by retardation effects. Therefore efficient screening is important in reducing $\mu^{\ast}$ sufficiently to allow for an electron-phonon driven superconductivity. In this way the Fullerides differ from the conventional picture, where retardation effects play a major role in reducing the electron-electron repulsion.

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