  It is demonstrated for the first time that the strong coupling between spin
moments of copper ions and oxygen holes, which arises upon hybridazation mixing
of two hole subsystems in the Emery model, not only affects the formation of
spin polaron quasiparticles but also ensures effective attraction between them
via the exchange interaction. This results in the Cooper instability with
d-wave pairing in a 2D ensemble of spin polaron quasiparticles. The T-x-phase
diagram obtained using this approach agrees well with the available
experimental data.
