Abstract
Large-grain melt-processed YBCO has been joined to create nominally `zero-angle' grain boundaries. Similar broadening of the resistive transition in both grains and the artificial boundary is observed in transport measurements up to 7 T. Direct and pulsed currents are used to obtain the high-field voltage-current characteristics which display power-law behaviour. The temperature and field dependence of the critical current in the boundary compares well with that of the grain material. The large critical current densities, above 2000 A cm-2 at 77 K for 4 T c-axis, show great promise for the joining technology to produce large-scale engineering artefacts.
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