Abstract
A simple model of 1-2-3 superconductors in which electrons (holes) in CuO 2 planes interact via exchange with two kinds of bosons is considered. Namely, via one-phonon exchange (weak coupling-Cooper pairing), and via paired holes on oxygen O 0 from Cu-O chains. The mechanisms of paired holes exchange (“charged bosons”-“O 0” exchange) considered here in strong coupling leads to the enhancement of the Fröhlich constant g f ( g 2 F→ Kg 2 F), and as a consequence to the enhancement of the Debye frequency ω D K = f K ω D , f K ≫ 1. In the proposed model the exact expression for the constant K is derived.
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