Abstract
Local electric field versus current density curves were measured in and single crystals using a miniature Hall-sensors array. Measurements in the field range corresponding to the anomalous magnetization peak in these crystals reveal remarkably different characteristics below and above the peak, indicating a crossover in the flux-creep mechanism. Similar behavior, as observed here in and is expected universally in every superconductor exhibiting the anomalous peak.
- Received 7 January 1998
DOI:https://doi.org/10.1103/PhysRevB.57.R14080
©1998 American Physical Society