Abstract
The magnetic field distribution, magnetic flux penetration and decays of trapped field, diamagnetic shielding and Meissner field have been measured in a disk of Y1Ba3Cu2.95Fe0.05O7−x at 77K for applied magnetic field up to 1000 G. The penetration of magnetic flux into the disk of Y1Ba2Cu2.95Fe0.05O7−x depends on both time and applied magnetic field. The flux penetration into a disk of Y1Ba2Cu3O7−x depends on applied field only. The time-delay behaviour in the Fe-doped disk is essentially a geometric effect due to the presence of voids and normal regions in this material. The activation energy for vortex-creep was found to be reduced from 1.6 eV down to 0.2–0.6 eV at an applied field above 30G due to the interaction between trapped vortices and supercurrents circulating around voids or normal regions.
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