Nonadiabatic superconductivity in fullerene-based materials
Grimaldi C.1, Cappelluti E.2, Pietronero L.2, Strassler S.1
1Departement de Microtechnique --- IPM, Ecole Polytecnique Federale Lausanne, Lausanne, Switzerland
2Department of Physics, University "La Sapienza" and INFM, Rome 1, Italy
Выставление онлайн: 17 февраля 2002 г.
Fullerene compounds have phonon frequencies up to omegamax=0.2 eV and Fermi energy of order EF=0.3 eV. It is therefore expected that the adiabatic parameter lambdaomegaph/EF, where lambda is the electron-phonon coupling constant and omegaph is a typical phonon frequency, is not negligible a priori and that the conventional phonon-mediated theory of superconductivity does not longer apply. Here we discuss how the conventional theory is inconsistent with a number of experimental data and provide a generalization of the theory in order to include nonadiabatic electron-phonon effects. We show that the inclusion of nonadiabatic channels in the electron-phonon interaction is a key element for the high values of Tc in these materials. We provide several predictions on superconducting and normal state properties of fullerene compounds susceptible to be tested experimentally.
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