Abstract
We use the magneto-optic imaging to determine the spatial distribution and the time dependence of the magnetic induction B z ( x,t) on the broad surface of the melt texture growth YBCO bulk. The model-independent effective activation energy U and the current density j could be calculated from B z ( x,t), ∂ B z ( x,t)/∂ t and ∂ B z ( x,t)/∂ x. The good fit shows that the thermally activated flux creep in the melt texture growth bulk is consistent with the logarithmic model in the temperature range of liquid nitrogen.
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