Abstract
The current redistribution of a highTc superconducting tape with increasing transport current in a magnetic field (Ha) was visualized. The external magnetic field was applied normal to thesurface of the sample after zero-field cooling, and the transport current (Ia) was increased stepwise from 0 to 90% of the values of the critical current (Ic(Ha))at Ha. The field distribution near the sample surface across the tape width (2w) was measured using the scanning Hall probe method. Applying an inversion to themeasured field distribution, we obtained the underlying current distribution. Theinitial fieldlike distribution was gradually changed into a currentlike distributionwith an increase of the transport current. The transition occurred whenIa andHa approachedthe line f = c in the f–c planewhere f = Ia/Ic and c = tanh(Ha/Hc).Hc is definedas Ic/(2πw).
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