SUPERCONDUCTING GAP WITHIN A MODIFIED INTERLAYER TUNNELING MODEL

A modified version of the interlayer tunneling model, including interl ayer single particle hopping (ISPH), is considered as a phenomenologic al model to describe cuprate superconductors. The effective ISPH (t(pe rpendicular to)(eff)) is taken along with a probability factor P, that involves the normal state pseudogap (E-g). This makes t(perpendicular to)(eff) to mimic experimental observations that ISPH is small in the underdoped regime and increases towards overdoping. Within the modifi ed model, we establish the absence of bilayer splitting as observed in case of layered cuprates. The transition temperature (T-c) and the su perconducting gap are calculated. A match, to the T-dependent supercon ducting gap data from experiment, is obtained and high values of the r atio of the superconducting gap to T-c are recovered. Depending on the values of E-g, T-c as a function of interlayer coupling shows mixed b ehaviour. This is a prediction and can be checked further. (C) 1998 El sevier Science B.V.