Abstract
Magnetization curves of hollow cylindrical samples of sintered high-Tc superconductors are derived both numerically, by means of a Josephson junction array model, and analytically, by a critical-state model. In both cases the field dependence of the critical current density Jc is assumed to have the following analytic form: Jc(h,T)=Jc0(T) H02(T)/[H0(T)2+h2]. The two descriptions are seen to be qualitatively equivalent.
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