Irreversibility line and anisotropy of magnetic melt textured Y1Ba2Cu3O7−δ studied by AC susceptibility

Magnetically melt textured YBa₂Cu₃O_7−δ samples have been studied by AC initial susceptibility measurements in the low field limit. The critical dynamic fields h^*_c and the relative position of the irreversibility line and of the critical line show that magnetic melt texturing leads to the creation of strong pinning sites. The anisotropy factor A is in agreement with the value obtained from magnetization under high DC fields. The A values are lower than in single cystals, but in agreement with the important orientation effects introduced by magnetic field texturing. These values also are typical of fabrication techniques involving a melting at some stage.