Coulomb Suppression of NMR Coherence Peak in Fullerene Superconductors

Han-Yong Choi

doi:10.1103/PhysRevLett.81.441

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Coulomb Suppression of NMR Coherence Peak in Fullerene Superconductors

Han-Yong Choi

DOI 10.1103/PhysRevLett.81.441 · Physical Review Letters

T1

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Abstract

The suppressed NMR coherence peak in the fullerene superconductors is explained in terms of the dampings induced by the Coulomb interaction between conduction electrons. The Coulomb interaction, modeled in terms of the on-site Hubbard repulsion, is incorporated into the Eliashberg theory of superconductivity with its frequency dependence considered self-consistently at all temperatures. The vertex correction is also included via the method of Nambu. The frequency dependent Coulomb interaction induces the substantial dampings in the superconducting state and, consequently, suppresses the anticipated NMR coherence peak of fullerene superconductors as found experimentally.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Rb2CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	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
Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown