Abstract
PC controlled setup for magneto- optical (MO) investigations of current- carrying superconducting films was developed. It included a current pulse circuit synchronized with the microscope and PC software for image processing allowing us to determine field distributions across superconducting strip using spatially-dependent calibration and iterative inversion to find current distributions. We study these distributions during and after a current pulse, with and without applied magnetic field, current re-distribution during the pulse, precursors to strip burn-out at high currents, and dendritic instability triggered by the pulse. We find critical-state behaviour accompanied by slow creep of magnetic flux at moderate currents in YBCO films, and fast avalanches related to heating effects at higher currents in YBCO and MgB2.
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Bobyl, A.V., Johansen, T.H., Shantsev, D.V. (2004). Flux Dynamics in Current-Carrying Superconductors. In: Johansen, T.H., Shantsev, D.V. (eds) Magneto-Optical Imaging. NATO Science Series, vol 142. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1007-8_26
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DOI: https://doi.org/10.1007/978-94-007-1007-8_26
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