Abstract
The variational Monte Carlo method is used to study possible superconducting states of a two-dimensional extended Hubbard model on a copper-oxygen lattice. It is found that d-wave and extended s-wave superconducting variational wave functions can have lower energy than the corresponding normal state for different parameter regions, while simple s-wave superconductivity is never favored. Increasing the nearest-neighbor repulsion and decreasing the copper-oxygen level separation can promote extended s-wave superconductivity and inhibit d-wave superconductivity.
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