Abstract
The pinning of flux lines by the twin planes is studied in bulk textured YBCO single domains using magnetic field angular measurements of c-axis critical current density Jc(Φ). Above a matching field BM associated with the twin boundary network, Jc(Φ) shows a fourfold peak structure related to the pinning by each variant of the twin plane (TP). Below BM, Jc is angular and field independent, which is consistent with a complete adaptation of the flux lines to the twin planes network. In the direction of the TP, Jc is independent of the field intensity up to 8 T suggesting that twin plane pinning might have a magnetic origin in addition to the core pinning effect.
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