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

Abstract

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.

arXiv comment4 pages, 3 EPSF figures embedded, REVTeX; minor revisions, accepted by PRL

References in corpus (3)

• Pseudogaps and their Interplay with Magnetic Excitations in the doped 2D Hubbard Model
• Fluctuation Exchange Analysis of Superconductivity in the Standard Three-Band CuO2 Model
• Superconducting instability in the Holstein-Hubbard model: A numerical renormalization group study

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