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We present here ^{13}C and ^{133}Cs NMR spin lattice relaxation T_{1} data inthe A15 and fcc-Cs_{3}C_{60} phases for increasing hydrostatic pressure throughthe transition at p_{c} from a Mott insulator to a superconductor. We evidencethat for p>> p_{c} the (T_{1}T)^{-1} data above T_{c} display metallic likeKorringa constant values which match quantitatively previous data taken onother A_{3}C_{60} compounds. However below the pressure for which T_{c} goesthrough a maximum, (T_{1}T)^{-1} is markedly increased with respect to theKorringa values expected in a simple BCS scenario. This points out theimportance of electronic correlations near the Mott transition. For p > p_{c}singular T dependences of (T_{1}T)^{-1} are detected for T >> T_{c}. It will beshown that they can be ascribed to a large variation with temperature of theMott transition pressure p_{c} towards a liquid-gas like critical point, asfound at high T for usual Mott transitions.

Spin Dynamics at the Mott Transition and in the Metallic State of the Cs_{3}C_{60} Superconducting Phases