Determination of inter- and intragrain critical current densities of YBCO ceramics in high fields by Hall magnetometry

摘要

A differential Hall magnetometer was built up to determine inter- and intragrain critical current densities of ceramic superconductors in high magnetic fields. The separation of both current types was performed by comparison of results from measurements on ceramics and on powders. to get the current density from the local field sensed by the Hall sensor, a model for the current flow in the ceramics is proposed which takes into account the granularity of the samples.