Abstract
Field-cooled magnetization m FC of YBa 2 Cu 3 O 7− x , Bi 2Sr 2CaCu 2O y and Tl 2Ba 2CaCu 2O z single-crystal superconductors has been studied as a function of thermal history. For the first time, a dependence of the Meissner fraction on the rate of cooling the sample was found. After a more rapid cooling, m FCW(T) on warming shows a pronounced minimum just before the transition into the normal state. This behaviour has been explained within a generalized critical state model, taking into account nonlinear flux diffusion.
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