Abstract
In this communication we report critical current measurements of melt processed DyBa 2Cu 3O 7− x samples determined by several measuring techniques. First the material was characterized by AC susceptibility and DC magnetization. The results are characteristic of good quality melt-processed (RE)BCO material with T c≈89 K and J c(77 K, 1 T) ≈ 10 4 A/cm 2. Next, pulsed currents were used in order to determine both I– V curves and transport critical currents. The origin of the discrepancy between transport and magnetic data has been discussed. The results point out significant local variations of the critical current density throughout the single domain.
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