Abstract
Submicron bridges in superconducting YBaCuO thin films with typical linear dimensions of about 100 nm have been fabricated. Experimental current-voltage characteristics of these structures are in reasonable agreement with numerical simulations based on true two dimensional viscous vortex motion and indicate the effect of switching from a single path motion at low transport currents to multiple paths at higher currents. The value of the viscous drag coefficient of this vortex motion is found to be about 10/sup -9/ kg/m.sec, which is about two orders of magnitude lower than one estimated from the Bardeen-Stephen model. Critical current densities in the investigated nanobridges are up to 5.10/sup 10/ A/m/sup 2/ at T=4.2 K. The critical current as a function of the width of the bridges indicates the dominating role of edge pinning.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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