Abstract
Flux pinning energies and their distributions at 77 K in a Powder-Melt-Textured-Grown YBa 2Cu 3O 7−δ sample have been determined by 90° rotating sample magnetic measurements. These measurements are done in three different configurations in which the relative orientations between the trapped flux and the depinning fields vary. Four kinds of peaks are found in the distribution curves. Besides the core pinning with energy of 0.2–0.3 eV, the results suggest the existence of magnetic pinning due to the energy decrease of both the core and the surrounding supercurrents of a flux line. Twin boundaries show the strongest pinning. Interactions between flux lines might have make an additional contribution.
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