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arxiv: cond-mat/0210169 · v2 · submitted 2002-10-08 · ❄️ cond-mat.supr-con · cond-mat.str-el

Increasing d-wave superconductivity by on site repulsion

classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords repulsionsuperconductivityd-wavefavoringadvantageattractionsawayband
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We study by Variational Monte Carlo an extended Hubbard model away from half filled band density which contains two competing nearest-neighbor interactions: a superexchange $J$ favoring d-wave superconductivity and a repulsion $V$ opposing against it. We find that the on-site repulsion $U$ effectively enhances the strength of $J$ meanwhile suppressing that of $V$, thus favoring superconductivity. This result shows that attractions which do not involve charge fluctuations are very well equipped against strong electron-electron repulsion so much to get advantage from it.

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