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The discovery in 1991 of high temperature superconductivity (SC) in A3C60compounds, where A is an alkali ion, has been initially ascribed to a BCSmechanism, with a weak incidence of electron correlations. However variousexperimental evidences taken for compounds with distinct alkali contentestablished the interplay of strong correlations and Jahn Teller distortions ofthe C60 ball. The importance of electronic correlations even in A3C60 has beenhighlighted by the recent discovery of two expanded fulleride Cs3C60 isomericphases that are Mott insulators at ambient pressure. Both phases undergo apressure induced first order Mott transition to SC with a (p, T) phase diagramdisplaying a dome shaped SC, a common situation encountered nowadays incorrelated electron systems. NMR experiments allowed us to establish that thebipartite A15 phase displays N\'eel order at 47K, while magnetic freezing onlyoccurs at lower temperature in the fcc phase. NMR data do permit us to concludethat well above the critical pressure, the singlet superconductivity found forlight alkalis is recovered. However deviations from BCS expectations linkedwith electronic correlations are found near the Mott transition. So, althoughSC involves an electron-phonon mechanism, correlations have a significantincidence on the electronic properties, as had been anticipated from DMFTcalculations.

NMR investigation of the pressure induced Mott transition to superconductivity in Cs3C60 isomeric compounds