Abstract
Taking into account the real crystalline structure of the $$\hbox {CuO}_2$$ plane and the strong spin-fermion coupling, the influence of the on-site Coulomb repulsion of holes $$U_p$$ and the intersite Coulomb repulsion $$V_2$$ between holes located at the next-nearest-neighbor oxygen ions on the formation of the superconducting gap with the d-wave symmetry of the order parameter of the spin-polaron quasiparticles is studied. It is shown that the formation of the resulting superconducting gap within the spin-fermion model is caused by three components. The dependence of the narrowing of the superconducting gap on the values $$U_p$$ and $$V_2$$ is analyzed.
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