Magnetic field dependence of critical current density in YBa₂Cu₃O₇

Abstract

We have measured the transport critical current densityJ cof sintered YBa₂Cu₃O₇, in various applied fields up to 185 Oe at 77 K. We find a sharp decay ofJ cwith magnetic field. We show that this sharp decay is consistent with the low field hysteresis results of Groveret al. We argue that the observed field dependence is not caused by intragranular weak links.