Abstract
In this paper, the pinning property of the melt texture Gd–Ba–Cu–O single domain has been examined by ac susceptibility measurements. An unexpected frequency dependence behavior of the irreversibility line Birr(T) has been found, in which the power n for Birr(T)∝(1−t)n is affected by frequencies of the ac fields, no longer kept as a constant as in the Yeshurun and Malozemoff theory. We present the abnormal frequency dependent behavior and interpret it in framework of the flux diffusion model.
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