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1.4.5 Pairing Mechanism in the Fulleride Superconductors

The narrowness of the conduction bands in the A3 materials and the large predicted values of the electron-electron Coulomb repulsion prompted exotic ``all electronic'' theoretical pairing models, e.g. [55]. In this model the electron screening is found under some conditions to reduce the electron-electron Coulomb repulsion to such a degree that it becomes effectively attractive in some energy range. However, nearly all the observations can be understood by a conventional electron-phonon pairing mechanism in which:

The success of this conventional pairing scheme challenges our understanding of superconductivity more generally, because In light of these considerations, perhaps the important question is why superconductivity in the fullerides can apparently be explained in the conventional picture of electron-phonon mediated pairing.


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Next: 1.5 Structure and Properties AC Up: 1.4 Structure and Properties AC Previous: 1.4.4 Parametrization of the