Coulomb pseudopotential, screening and superconductivity in C60

O. Gunnarsson; G. Zwicknagl

doi:10.1103/PhysRevLett.69.957

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Coulomb pseudopotential, screening and superconductivity in C60

O. Gunnarsson, G. Zwicknagl

DOI 10.1103/PhysRevLett.69.957 · Physical Review Letters

T1

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Abstract

We estimate the Coulomb pseudopotential μ* for a model of undoped C60, renormalizing away all subbands but the t1u conduction band by summing ladder diagrams in the screened interaction. The renormalization of μ* is small. For doped C60 the screened U is calculated. A very efficient metallic screening is found for the intraband U, but not for the interband U, suggesting a large renormalization of μ* within a ladder diagram approach. Exact results for a two-band model suggest, however, that the ladder diagrams strongly overestimate the renormalization.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown