Overscreening in Hubbard electron systems

Details Overscreening in Hubbard electron systems Overscreening in Hubbard electron systems

1998-05-12

arxiv.org/abs/cond-mat/9805133v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, Revtex

Scientific paper

We show that doping-induced charge fluctuations in strongly correlated Hubbard electron systems near the 1/2-filled, insulating limit cause overscreening of the electron-electron Coulomb repulsion. The resulting attractive screened interaction potential supports d_{x^2-y^2}-pairing with a strongly peaked, doping dependent pairing strength at lower doping, followed by s-wave pairing at larger doping levels.

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