NATURE OF THE MICROWAVE RESPONSE OF A YBACUO JOSEPHSON-JUNCTION ON A BICRYSTALLINE SUBSTRATE

The response of YBaCuO Josephson junctions on a bicrystalline substrat e to the action of microwave radiation is found to contain, besides th e Josephson response, a contribution associated with the tunneling of quasiparticles through channels formed by localized states in the regi on of the Josephson junction. It is shown that this contribution is as sociated with an increase in the conduction through these channels und er the action of the radiation on the junction. (C) 1996 American Inst itute of Physics.