Anomalous behavior in transport critical current density of YBa2Cu3O7−x and YBa2Cu3O7−x-Ag bulk samples

Abstract
Transport critical current density Jc versus temperature measurements on bulk YBa2Cu3O7−x and YBa2Cu3O7−x‐Ag samples were carried out. An anomalous bifurcation in JcT curves was observed at temperatures between 55 and 88 K. The bifurcation was introduced by application of a transient pulse. The x‐ray, scanning electron microscopy, and electron microprobe analysis results on these samples are presented.