Abstract
We have measured the DC magnetization of melt textured and single crystal YBCO samples in crossed AC and DC fields, as a function of sweep rate, time and orientation ( h AC‖ c, h AC‖ ab plane). We observe that besides decreasing with h AC amplitude, the DC magnetization in swept fields ( Ḣ>0) also decreases as the log of AC field frequency. The rate of decrease 1/ M 0(Δ M/Δ ln f) is observed to be close to the flux creep rate. Magnetic relaxation both in zero and crossed fields are found to obey logarithmic time variation, with time constants decreasing with increasing f. The short time relaxation clearly shows the effects of frequency and enables an interpretation of the ln f dependence in terms of flux creep effects. AC magnetization measurements confirm both the homogenizing of the DC flux distribution due to the AC fields and the effect of field sweep in competing with the depinning due to the AC field.
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