Effect of symmetry of the electron states of HTSC on the current-voltage characteristics of SIS junctions

The current-voltage (IV) characteristics of SIS junctions are calculated in the framework of a multiband model with an anisotropic effective order parameter of HTSC. The results of calculations show that the shape of the IV characteristic and of the density of electron states changes significantly depending on the parameters of the model. A theoretical explanation is proposed for the experimentally observed s-like behavior of the IV characteristics of SIN and SIS junctions with BSCCO-type superconductors. The dependence of the superconducting peak asymmetry on the mutual arrangement of the bands is analyzed. The difference between the obtained results and the results of one-band models with the s and d symmetries of the order parameter is discussed. (C) 2002 MAIK "Nauka / Interperiodica".