Coulomb suppression of NMR coherence peak in fullerene superconductors

Details Coulomb suppression of NMR coherence peak in fullerene superconductors Coulomb suppression of NMR coherence peak in fullerene superconductors

1997-11-07

arxiv.org/abs/cond-mat/9711060v2

Physics

Condensed Matter

Superconductivity

4 pages, Revtex, and 2 figures. Revised and final version to appear in Phys. Rev. Lett. (1998)

Scientific paper

10.1103/PhysRevLett.81.441

The suppressed NMR coherence peak in the fullerene superconductors is explained in terms of the dampings in the superconducting state induced by the Coulomb interaction between conduction electrons. The Coulomb interaction, modelled in terms of the onsite 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.

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