EFFECT OF O-O TRANSFER UPON A HOLE IN CUO2 PLANES OF HTS

The formation of spin polarons (spin-polarized clusters) in the weakly doped antiferromagnetically ordered CuO2 planes of high-T-c cuprates is investigated. The influence of additional holes is calculated withi n a self-consistent mean-field approximation, by taking O-O hybridizat ion (characterized by the parameter t) into account. It is shown that the binding energy and the polarization of clusters strongly depend on the value and the sign of t, i.e., a positive t promotes the spin pol aron formation, while a negative t suppresses it. For the common value t similar to 0.3 - 0.6 eV two polaron states with binding energies si milar to 0.5 eV and similar to 0.3 eV are obtained.