ROLE OF INTERLAYER INTERACTIONS ON TRANSITION-TEMPERATURE IN HIGH-T-CCUPRATE SUPERCONDUCTORS

The effect of interlayer interactions on transition temperature in hig h-T-c layered superconductors has been studied using a one-band two-la yer tight binding Hamiltonian with intra- and interlayer attractive in teractions. The double-time Green's function technique is employed and higher-order Green's functions are linearized by using a mean field d ecoupling approximation. The expressions for the transition temperatur e (T-c) and excitonic type interlayer correlation (gamma(c)) are obtai ned. It is shown that interlayer interactions play an important role i n the enhancement of T-c in high-T-c cuprates. We have also explained the relevance of our results in high-T-c layered superconductors havin g two layers per unit cell under externally applied pressure.