Abstract
The delocalization of the doped holes in a sheet of the superconducting oxides is investigated. It leads to the formation of a mixture of Fermi-liquid and spin-liquid. The exchange interaction between them is proven to be weak and the Fermi-liquid feature of the itinerant holes is ensured. This exchange leads to the long-range RKKY interaction among the isolated spins embedded in the spin-liquid, and under certain condition can produce an incommensurate spin configuration. For the Fermi-liquid, the spin-flip part of this exchange provides a pairing mechanism of the singlet type in high frequency window. It is found that the Coulomb repulsion within a pair is suppressed by the pseudopotential effect in the unscreened case. The relation to other mechanisms which also produce the pairing in high frequency window is discussed. The possibility of co-appearance of superconductivity and incommensurate spin configuration is analyzed. Several critical doping concentrations are estimated.
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