Abstract
Abstract We show that in superconducting materials with CuO 2 layers spin-polarons associated with itinerant holes in the e v band (Cu dz 2 - Opπ band,) are created by strong intra-atomic exchange interaction (Hund's coupling) with localized dx 2 −y 2 holes. Then the interplay of Hund's coupling and superexchange between Cu 2+ (dx 2 −y 2 ) spins gives rise to an attractive exchange interaction between spin-polarons, which leads to the formation of spin-singlet spin-polarons pairs. This contributes to high temperature superconductivity. By solving an gap equation it is shown that the s-wave pairing reproduces the observed x dependence of T c as well as the right magnitudes of T c in (La 1− x Sr x ) 2 CuO 4 satisfactorily.
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