Flux dynamics in a single crystal of Bi sub 2 Sr sub 2 CaCu sub 2 O sub x

1991 
We report on a systemmatic study of the long-time decay of the irreversible magnetization of a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub x} single crystal. The decay of magnetization cannot be well described by the Anderson-Kim flux creep model. We interpret the magnetic relaxation data with the self-organized criticality theory. In contrast to the flux creep models in which only uncorrelated, individual flux hoppings occur, SOC theory describes a spatially and temporally correlated dynamics. The time dependence of magnetization can best be characterized by a stretched exponential, exp({minus}(t/t{sub 0}){sup n}) (0 < n < 1), or Kohlrausch's law. We argue that the dynamics of flux creep in Bean's critical state is governed by an avalanche-like dynamics of SOC theory. 13 refs., 2 figs.
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