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The discovery in 1991 of high temperature superconductivity (SC) in A3C60compounds, where A is an alkali ion, has been rapidly ascribed to a BCSmechanism, in which the pairing is mediated by on ball optical phonon modes.While this has lead to consider that electronic correlations were not importantin these compounds, further studies of various AnC60 with n=1, 2, 4 allowed toevidence that their electronic properties cannot be explained by a simpleprogressive band filling of the C60 six-fold degenerate t1u molecular level.This could only be ascribed to the simultaneous influence of electroncorrelations and Jahn-Teller Distortions (JTD) of the C60 ball, whichenergetically favour evenly charged C60 molecules. This is underlined by therecent discovery of two expanded fulleride Cs3C60 isomeric phases which areMott insulators at ambient pressure. Both phases undergo a pressure inducedfirst order Mott transition to SC with a (p, T) phase diagram displaying a domeshaped SC, a common situation encountered nowadays in correlated electronsystems. NMR experiments allowed us to study the magnetic properties of theMott phases and to evidence clear deviations from BCS expectations near theMott transition. So, although SC involves an electron-phonon mechanism, theincidence of electron correlations has an importance on the electronicproperties, as had been anticipated from DMFT calculations.

Electronic correlations, Jahn-Teller distortions and Mott transition to superconductivity in alkali-C60 compounds