Increasing d-wave superconductivity by on site repulsion
超导电性
2009-11-07 v2 强关联电子
摘要
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 favoring d-wave superconductivity and a repulsion opposing against it. We find that the on-site repulsion effectively enhances the strength of meanwhile suppressing that of , 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.
引用
@article{arxiv.cond-mat/0210169,
title = {Increasing d-wave superconductivity by on site repulsion},
author = {E. Plekhanov and S. Sorella and M. Fabrizio},
journal= {arXiv preprint arXiv:cond-mat/0210169},
year = {2009}
}
备注
4 pages, 3 figures