Nonadiabatic Channels in the Superconducting Pairing of Fullerides

Original · EN

We show the intrinsic inconsistency of the conventional phonon mediated theory of superconductivity in relation to the observed properties of Rb₃C₆₀. The recent, highly accurate measurement of the carbon isotope coefficient α C=0.21, together with the high value of Tc (30 K) and the very small Fermi energy E F (0.25 eV), unavoidably implies the opening of nonadiabatic channels in the superconducting pairing. We estimate these effects and show that they are actually the key elements for the high value of Tc in these materials compared to the very low values of graphite intercalation compounds.