Screening, Coulomb Pseudopotential, and Superconductivity in Alkali-Doped Fullerenes

Erik Koch; Olle Gunnarsson; Richard M. Martin

doi:10.1103/PhysRevLett.83.620

← Back to search

Screening, Coulomb Pseudopotential, and Superconductivity in Alkali-Doped Fullerenes

Erik Koch, Olle Gunnarsson, Richard M. Martin

DOI 10.1103/PhysRevLett.83.620 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We study the static screening in a Hubbard-like model using quantum Monte Carlo methods. We find that the random phase approximation is surprisingly accurate almost up to the Mott transition. We argue that in alkali-doped fullerenes the Coulomb pseudopotential μ* is not very much reduced by retardation effects. Therefore efficient screening is important in reducing μ* sufficiently to allow for an electron-phonon driven superconductivity. In this way the fullerides differ from the conventional picture, where retardation effects play a major role in reducing the electron-electron repulsion.

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
Cs3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown