Flux creep in the melt‐processed Bi‐based oxide superconductors including normal particles

摘要

The Bi‐based (2212) single grains including a large number of normal particles, (Ca,Sr)2Cu1O3, were synthesized by a melt process. To characterize the flux creep behavior in such a superconductor, magnetization measurements were performed at various temperatures and magnetic fields. The flux creep rate exhibited a maximum at 20 K in both magnetic fields parallel and normal tocaxis. The magnetic field dependence of the pinning potential,U0, evaluated from the residual magnetization was not represented by the expression,B−agr;, in Y1Ba2Cu3O7superconductors. The relation betweenU0and the critical current density is discussed.