Abstract
It is shown that mechanical deformation enhances intragrain flux pinning in silver-sheathed tapes of the (Bi, Pb) 2Sr 2Ca 2Cu 3O x (2223) material. Tapes with zero transport critical current density ( J ct) - but nonzero magnetic hysteresis - were produced with prereacted 2223 powders. Comparisons of the hysteresis in tapes directly after a heat treatment and after a subsequent pressing step show a clear increase of the hysteresis, almost a factor of three at 20 K and 3 T, corresponding to a five-fold increase in J c. The J c values can be lowered again by an additional heat treatment. Bent platelets can be observed in the microstructure after, but not before, pressing, suggesting that dislocations that could have been introduced in the pressing step may act as pinning centers.
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