1999/02/17 by Erik Koch, O. Gunnarsson, Olle Gunnarsson +1 · 4 citations
Chemistry · Physics and Astronomy · #Advanced Chemical Physics Studies #Fullerene Chemistry and Applications #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.83.620
published as Phys.Rev.Lett. 83, 620 (1999) · 4 pages RevTeX with 2 eps figures, additional material available at http://www.mpi-stuttgart.mpg.de/docs/ANDERSEN/fullerene/
arxiv created 1999/02/17 · openalex publication_date 1999/07/19 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the static screening in a Hubbard-like model using quantum Monte Carlo methods. 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 \ensuremathμ* is not very much reduced by retardation effects. Therefore efficient screening is important in reducing \ensuremathμ* 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.