Scaling of the Coulomb pseudopotential in s-wave narrow-band superconductors

Tae-Ho Park; Han-Yong Choi

doi:10.1103/PhysRevB.65.052504

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Scaling of the Coulomb pseudopotential in s-wave narrow-band superconductors

Tae-Ho Park, Han-Yong Choi

DOI 10.1103/PhysRevB.65.052504 · Physical Review B

T1

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Abstract

The Coulomb pseudopotential μ* is extracted by fitting the numerically calculated transition temperature Tc of the Eliashberg-Nambu equation that is extended to incorporate the narrow-band effects, that is, the vertex correction and the frequency dependence of the screened Coulomb interaction. It is shown that even for narrow-band superconductors, where the fermi energy εF is comparable with the phonon frequency ωph, the Coulomb pseudopotential is a pertinent parameter, and is still given by μ*=μ/[1+μln(εF/ωph)], provided ωph is appropriately scaled.

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