Nonadiabatic Channels in the Superconducting Pairing of Fullerides

2001/05/29 by E. Cappelluti, C. Grimaldi, L. Pietronero +1 · 1 citation
Physics and Astronomy · #cond-mat.supr-con

paper · pdf

published as Phys. Rev. Lett. vol.85, p.4771 (27 nov. 2000) · 4 pages, 4 eps figures

arxiv created 2001/05/29 · arxiv updated 2009/11/30

Abstract

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_{\rm C}=0.21, together with the high value of T_c (30 K) and the very small Fermi energy E_{\rm 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 T_c in these materials compared to the very low values of graphite intercalation compounds.

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