SUPERCONDUCTIVITY IN THE D-P MODEL - EFFECTS OF QUASI-2D FLUCTUATION

Effects of quasi-2D fluctuations on superconducting transition mediate d by spin-fluctuations via superexchange interactions in the d-p model are investigated based on the formalism first employed by Nozieres an d Schmitt-Rink together with the slave-boson technique and expansion f rom the limit of the large spin-orbital degeneracy N (1/N-expansion). By calculating superconducting transition temperature T-c, NMR relaxat ion rate 1/T-1 and Knight shift K, these effects are shown to account for qualitative features of the phase transition observed in high-T-c superconducting materials.