d-Wave Pairing in the Presence of Long-Range Coulomb Interactions

Details d-Wave Pairing in the Presence of Long-Range Coulomb Interactions d-Wave Pairing in the Presence of Long-Range Coulomb Interactions

1998-06-22

arxiv.org/abs/cond-mat/9806264v2

G. Esirgen, H.-B. Schuttler, and N. E. Bickers, Phys. Rev. Lett. 82, 1217 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 EPSF figures embedded, REVTeX; minor revisions, accepted by PRL

Scientific paper

10.1103/PhysRevLett.82.1217

The one-band extended Hubbard model in two dimensions near band-filling 1/2 is solved in the fluctuation exchange approximation, including the long-range (1/r) part of the Coulomb interaction, up to 4th neighbor distance. Our results suggest that d_(x^2 - y^2) pairing in the Hubbard model is robust against the inclusion of long-range Coulomb interactions with moderate 1st neighbor repulsion strength V_1. d_(x^2 - y^2) pairing is suppressed only at large V_1 (>~ 0.25U-0.4U), due to incipient charge density wave instabilities.

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