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Increasing d-wave superconductivity by on site repulsion

E. Plekhanov·S. Sorella·M. Fabrizio
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Abstract

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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E. Plekhanov, S. Sorella, M. Fabrizio. 2003-05-08. Increasing d-wave superconductivity by on site repulsion. https://doi.org/10.1103/physrevlett.90.187004

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