STUDY OF THE LOCAL MAGNETIC-RELAXATION IN MELTING-TEXTURED-GROWTH YBA2CU3O7-DELTA BULK SAMPLE WITH BI HALL PROBE

Using Bi Hall probe, the time dependence of the local induction B at d ifferent locations on the surface of a melting-textured-growth (MTG) Y BCO bulk sample was measured at liquid nitrogen temperature. The behav ior of the Hall voltage V-H(t) shows a marked fluctuation and is quali tatively similar for most geometrically equivalent points on the surfa ce. But for the places with different distances from the center on the surface the V-H(t) behavior can be quite different.