Abstract
Abstract We measured the critical current of thin strips of sintered YBCO deposited by electrophoresis or sedimentation on an Ag substrate. The typical granulometry of deposited samples was about 1 μm. The critical current of the samples was measured as a function of the temperature (from the transition temperature down to LHe) and of the magnetic field. The current density versus temperature and magnetic field behavior shows a number of interesting features. The current increases quadratically on decreasing temperature and the half width of the I versus B curves increases slightly, with a value in agreement with the junction size. We show that these effects can be explained in the framework of BCS theory, by modelling the material as a network of weak links with small dimensions having a normal barrier.
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