Abstract
Abstract We summarize our previous studies on transport critical current density and present transport and electron microscopy data that provide significant physical insights into grain boundary weak-links and transport properties. By changing the sintering parameters and liquid processing methods, the transport Jc in the plateau regime is considerably increased. We conclude that transport Jc characteristics under a magnetic field are determined mainly by the portions of strongly coupled regions at grain boundaries. Thus, the transport Jc may not necessarily be connected with the gross orientation of the grain boundaries. The magnitude of the transport Jc under a magnetic field is proportional to the total area of the strongly coupled regions at the grain boundaries.
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