Nonadiabatic Channels in the Superconducting Pairing of Fullerides
E. Cappelluti, C. Grimaldi, L. Pietronero, S. Strässler
DOI 10.1103/PhysRevLett.85.4771 · Physical Review Letters
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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 αC=0.21, together with the high value of Tc (30 K) and the very small Fermi energy EF (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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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