Superconductivity in molecular solids with Jahn-Teller phonons

Details Superconductivity in molecular solids with Jahn-Teller phonons Superconductivity in molecular solids with Jahn-Teller phonons

2002-08-23

arxiv.org/abs/cond-mat/0208454v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 page, RevTeX, 4 eps figures, additional material available at http://www.mpi-stuttgart.mpg.de/andersen/fullerene/

Scientific paper

We analyze fulleride superconductivity at experimental doping levels, treating the electron-electron and electron-phonon interactions on an equal footing, and establish the existence of novel physics which helps explain the unusually high superconducting transition temperatures in these systems. The Jahn-Teller phonons create a local (intramolecular) pairing that is surprisingly resistant to the Coulomb repulsion, despite the weakness of retardation in these low-bandwidth systems. The requirement for coherence throughout the solid to establish superconductivity then yields a very strong doping dependence to Tc, one consistent with experiment and much stronger than expected from standard Eliashberg theory.

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