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The dynamics of transient current distributions in superconducting YBCO thinfilms were investigated during and immediately following an external fieldramp, using high-speed (real-time) Magneto-Optical Imaging and calculation ofdynamic current profiles. A number of qualitatively unique and previouslyunobserved features are seen in this novel analysis of the evolution ofsupercurrent during penetration. As magnetic field ramps up from zero, thedynamic current profile is characterized by strong peaks, the magnitude ofwhich exceed the conventional critical current density (as determined fromstatic current profiles). These peaks develop close to the sample edges,initially resembling screening currents but quickly growing in intensity as theexternal field increases. A discontinuity in field and current behaviour isnewly observed, indicating a novel transition from increasing peak currenttoward relaxation behaviour. After this transition, the current peaks movetoward the centre of the sample while reducing in intensity as magneticvortices penetrate inward. This motion slows exponentially with time, with thecurrent distribution in the long-time limit reducing to the expected Kim-modelprofile.

Observation of Transient Overcritical Currents in YBCO Thin Films using High-Speed Magneto-Optical Imaging and Dynamic Current Mapping