Isotope effect with nonadiabatic contribution from purely electronic pairing in superconducting fullerides

Yu. N. Gartstein; A. A. Zakhidov; E. M. Conwell

doi:10.1103/PhysRevB.49.13299

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Isotope effect with nonadiabatic contribution from purely electronic pairing in superconducting fullerides

Yu. N. Gartstein, A. A. Zakhidov, E. M. Conwell

DOI 10.1103/PhysRevB.49.13299 · Physical Review B

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Abstract

The isotope effect on the superconducting transition temperature is reexamined in the model proposed by Chakravarty et al. where phonons modulate the electron-electron attraction energy on C60 molecules. We find additional contributions to the effective interaction that increase the magnitude of the isotope shift. One of these contributions, which is nonadiabatic, has a stronger dependence on the intermolecular motion of electrons, which could result in an enhanced isotope effect in disordered samples.

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
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown