Abstract
A periodic array of nanoscale twin boundaries (TBs) was formed inside melt-processedYBa2Cu3O7−δ (YBCO) with Ru additions. The pinning efficiency of the resulting material is stronglymodified in the presence of such disorder. The arrangement of the regular TBs along thec-axishas a strong influence on the irreversibility line and critical current density. We found a characteristic kinkat Bcr = 2.75 Ton the c-axis irreversibility line, indicative of correlated disorder. The fieldtilt angle below which pinning by the TB is effective is found to be∼40°. Detailed investigations of glassy dynamics show that the TB structure that appears willinhibit the motion of vortices in the variable-range-hopping regime below the effectivematching field. We have attempted to reconcile our data with the predictions of theBose-glass model for correlated disorder.
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