Strong superconductivity with local Jahn-Teller phonons in C60 solids.
We analyze fulleride superconductivity at experimental doping levels, treating the electron-electron and electron-phonon interactions on an equal footing, and demonstrate that the Jahn-Teller phonons create a local (intramolecular) pairing which is surprisingly resistant to the Coulomb repulsion, despite the weakness of retardation in these low-bandwidth systems. The requirement for coherence throughout the solid then yields a very strong doping dependence to T(c), one consistent with experiment and much stronger than expected from standard Eliashberg theory.
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA.
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Han
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Gunnarsson
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Crespi