Isotopic disorder in superconducting fullerenes

D. M. Deaven; Daniel S. Rokhsar

doi:10.1103/PhysRevB.48.4114

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Isotopic disorder in superconducting fullerenes

D. M. Deaven, Daniel S. Rokhsar

DOI 10.1103/PhysRevB.48.4114 · Physical Review B

T1

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Abstract

The superconducting transition temperature of doped fullerenes appears to be unusually sensitive to partial substitution of C13 for the naturally abundant isotope C12. We show that the electron-phonon coupling constant λ is generically independent of isotopic disorder. By studying the effects of isotopic substitution on phonon-mediated superconductivity in C60 within the Migdal-Eliashberg theory we conclude that the theoretical superconducting transition temperature Tc does not show any anomalous dependence on isotopic substitution in weak or strong coupling. We comment on the possible causes of the experimentally observed effect.

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.	—	Pressure not reported	unknown
Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown