Abstract
The (110) twin boundary separation d has been varied from 1500 AA to 300 AA by annealing polycrystalline samples in air at different temperatures ranging from 400 to 700 degrees C. The intragrain critical current density Jc and its in-field behaviour are strongly affected by the variation of the superconducting properties and the microstructures. Jc(H) has been found to drop more rapidly with increasing field as the d value decreases. This decrease in Jc with increasing field may be associated with the weak link effects created by the twin boundaries and a corresponding decrease in pinning effectiveness. The corresponding pinning mechanisms are discussed.
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