Abstract
We present a study of superconducting correlations associated to the mechanism of spin-polaron pairing resulting from an attractive exchange interaction between spin-polarons. The spin-polarons associated with itinerant holes in CuO 2 are assumed to be created by strong intra-atomic exchange interaction with quasi-localized spins. The interplay of Hund's coupling and superexchange between quasi-localized spins gives rise to an attractive interaction between spin-polarons which leads to the formation of spin-singlet spin-polaron-pairs. The two-particle Green function in the ladder approximation for the itinerant holes with this attractive interaction is used to calculate in ( La 1-x Sr x)2 CuO 4 the dependence on the hole concentration of the critical temperature T c . The obtained results reproduce the experimental observations satisfactorily.
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