Electron-phonon coupling strength and implications for superconductivity in alkali-metal-doped fullerenes

R. A. Jishi; M. S. Dresselhaus

doi:10.1103/PhysRevB.45.2597

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Electron-phonon coupling strength and implications for superconductivity in alkali-metal-doped fullerenes

R. A. Jishi, M. S. Dresselhaus

DOI 10.1103/PhysRevB.45.2597 · Physical Review B

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Abstract

A comparison between the electron-phonon coupling strength in graphite intercalation compounds and alkali-metal-doped C60 is considered. It is shown that the curvature of C60 leads to a slight reduction in the modulation of the single-site matrix element in comparison with the corresponding value in graphite. Nevertheless, the curvature of C60 makes it possible for electrons to couple with the low-frequency radial modes. This coupling causes the value of the dimensionless electron-phonon coupling parameter, λ, to be reasonably large. The large value of λ together with a large value of the density of states at the Fermi level, in turn, readily yields a transition temperature of the order of 30 K for alkali-metal-doped C60 compounds.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
M3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
C3K Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3	Pressure not reported	unknown