Abstract
We measured the magnetization curves of RBa 2Cu 3O 7-y (R=Eu, Dy, Er, Gd, Y) with T c(R=0)≥90K both at low fields (≤84 Oe) and higher fields (up to 4.7 Tesla) at the temperatures of 4.2K and 77K. Hysteresis loops with a reversible straight line were observed at low fields. These hysteresis loops can be explained by the critical state model of a weak link granular superconductor. J c values calculated from these hysteresis loops at low fields agreed in the order of magnitude (10 2–10 3 A/cm 2) with results of critical transport current measurements of bulk samples of this kind of ceramic oxide superconductors. By contrast, J c values calculated from magnetization curves in high field range agreed in the order of magnitude (10 5–10 6 A/cm 2) with the critical transport current results for epitaxial thin films of YBa 2Cu 3O 7-y.
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