Nonadiabatic channels in the superconducting pairing of fullerides

We show the intrinsic inconsistency of the conventional phonon mediated the ory of superconductivity in relation to the observed properties of Rb3C60 T he recent, highly accurate measurement of the carbon isotope coefficient al pha (C) = 0.21, together with the high value of T-c (30 K) and the very sma ll Fermi energy E-F (0.25 eV), unavoidably implies the opening of nonadiaba tic channels in the superconducting pairing. We estimate these effects and show that they are actually the key elements for the high value of T-c in t hese materials compared to the very low values of graphite intercalation co mpounds.