Abstract
The so-called t - t '- J model, i.e. t - J model together with the second- and the third-neighbor transfer terms, is investigated as a model for the high- T c oxide superconductors. The exchange term is treated by the Schwinger boson mean field theory, and the transfer terms are treated by the second-order perturbation theory. It is shown that the spin fluctuation leads to an effective interaction between holes, the magnitude and sign of which depend on the sign of the second- and the third-neighbor transfer integrals. The interaction is strong enough to explain the high transition temperature of the oxides.
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