Electron-phonon coupling and superconductivity in alkali-intercalated C60 solid

M. Schluter; M. Lannoo; M. Needels; G. A. Baraff; D. Tománek

doi:10.1103/PhysRevLett.68.526

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Electron-phonon coupling and superconductivity in alkali-intercalated C60 solid

M. Schluter, M. Lannoo, M. Needels, G. A. Baraff, D. Tománek

DOI 10.1103/PhysRevLett.68.526 · Physical Review Letters

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Abstract

We propose that superconductivity in A3C60 (A=K, Rb) with Tc≥30 K results from a favorable combination of high phonon frequencies and the existence of two different energy scales optimizing the coupling constant λ=NV. Calculations show that electron scattering V is dominated by particular on-ball Jahn-Teller-type modes on the scale of the large on-ball π-hopping energy, while the density of states N is controlled by the weak interball hopping energy. This factorization has several observed experimental consequences. Crucial differences to intercalated graphite explain the much smaller Tc values in the graphite compounds.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	onset
Rb2CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown