Abstract
The extended Hubbard model for the two-dimensional CuO{sub 2} plane is studied using a variational Monte Carlo method to identify the pairing mechanism of doped holes in high-{ital T}{sub {ital c}} superconductors. A new trial wave function is proposed which includes competing magnetic correlations consisting of antiferromagnetic interactions between Cu-Cu and Cu-O sites. With this magnetically frustrated trial wave function, results on the ground-state energies reveal an effective attraction between doped holes for large Coulomb repulsion on Cu sites. Studies of correlation functions show that the pairing of doped holes arises mainly from the parallel coupling between oxygen spins separated by double hops and in a subsidiary way from the antiparallel coupling between oxygen spins separated by quadruple hops, both of which are caused by the reduction of energy loss due to magnetic frustration around the oxygen hole.
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