Flux penetration into a current-carrying YBaCuO film
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Magneto-optical images show the flux distribution around a thin YBaCuO strip
with transport current, as it increases from zero to 5.7 A.
The flux penetrates
deeper and deeper into the sample and
the Meissner region in the center (the dark area) shrinks.
The field always has maxima at the strip edges.
T = 15 K; YBaCuO strip dimensions: 100x500 microns, thickness 200 nm; the film is prepared by magnetron sputtering. Average current density corresponding to the maximal current is 3*107 A/cm2, the magnetic field at the edges reaches 300 G. Published in Phys. Rev. B 59, 9655-9664 (1999) Abstract, PDF.
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