FLUX-FLOW IN HIGH-T(C) JOSEPHSON-JUNCTIONS

The possibility of achieving fluxon nucleation in nonhysteretic high-T (c) Josephson junctions due to the presence of inhomogeneities is inve stigated numerically. For a large range of parameters the I- V charact eristics in presence of such discontinuities show a strong similarity with those obtained experimentally. The spatial inhomogeneities consid ered are on the scale of the Josephson penetration depth (mum). It is demonstrated that the topic is of interest for the construction of amp lifiers. Thus when fluxons are generated the resulting flux flow regim e proves to be much more sensitive than the uniform solution to extern al fields.