TEMPERATURE-DEPENDENT GAP ANISOTROPY FROM INTERLAYER TUNNELING

We show that the interlayer tunneling mechanism of high temperature su perconductivity has a novel consequence, viz., a gap anisotropy that i s strongly temperature dependent. In particular, the superconducting g ap along the (0, pi) direction shows a weaker temperature dependence t han the gap along the (pi, pi) direction which decreases rapidly with temperature. This can be verified, for instance, by ARPES experiments and we suggest this feature may have already been observed.