EFFECT OF INTERLAYER INTERACTION IN HIGH-T-C CUPRATE SUPERCONDUCTORS

We have studied the role of interlayer attractive interaction in a hig h-T-c system having two layers per unit cell. The single band two-laye r tight binding model Hamiltonian is considered and the double time Gr een's function technique is applied within the mean field approximatio n. The expressions for the hole density, transition temperature, and i ntra- and interlayer order parameters are obtained which are found to be dependent on the interlayer interaction and other parameters appear ing in the Hamiltonian. The numerical analysis shows' that the couplin g of the charge carriers (holes) between the layers provides better co nditions for the stabilization of long-range order and high supercondu cting transition temperature in layered superconductors. It is also ob served that superconductivity is confined to a narrow region of hole c oncentration and the single particle tunneling suppresses the transiti on temperature.