Abstract
Abstract By measurement of the ac permeability of ceramic YBCO we determine a line in the B-T plabe separating regions of flux expulsion from those of large penetration. The line intersects the temperature axis below T c and does not scale with the sample radius, implying that simple critical state models are not appropriate to describe the nature of the magnetic hysteresis. A model where the flux penetration is caused by the onset of strong thermally activated creep across grain boundaries is proposed. The magnetic hysteresis are mainly governed by the time scale of the measurement and depends only weakly on the sample radius.
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