Abstract
To introduce a high density of homogeneously distributed defects in YBa2Cu3O7−δ (Y123), melt textured samples were shock-compacted at pressures up to 12.6 GPa (126 Kbar) at orientations favorable to slip along the basal planes.1 Shock compressing melt-textured Y123 results in a nearly uniform detect density which is two to three orders of magnitude higher than in unshocked melt-textured material. However, the intergranular critical current density in bulk samples (Jcb) decreases by two orders of magnitude in the as-shocked state. This decrease in Jcb is attributed to microfractures. However, if the shocked disk is annealed in O2 then ground, sieved, and magnetically aligned, Jc for H τ c-axis (Jcab) is enhanced two to three times over the unshocked value. This indicates that the increase in dislocations density does increase flux-pinning.
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