Abstract
Abstract The spatial distributions of vortices in equilibrium (the critical state) in a sintered YBa 2 Cu 3 O 7 sample are studied by three-dimensional neutron depolarization (3DND), in field and for remanent states. Neutron depolarization provides the magnetization, the length of vortex straightness and the direction cosine of vortex bundles in the sample. By scanning a neutron beam through the sample, the position dependence of these vortex-distribution parameters are determined. From the length of vortex straightness and the position dependence of the magnetization it is found that vortices penetrate between the clusters of grains in small applied field and are pinned in the grain clusters in remanence after a field pulse.
Published Version
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