Abstract
A variety of mechanisms for supercurrent transport in (Bi, Pb)2 Sr2 Ca2 Cu3 Ox (Bi-2223) tapes have been proposed, including the brick-wall and railway-switch models and the more recent freeway model. In this article, these models are compared to a growing library of data, including structural and transport studies on specific grain boundary types as well as the systematics of microstructure and transport in the polycrystalline tapes, including new transmission electron microscopy data on some of the highest-performing samples yet fabricated. Additionally, the freeway model is developed, with the concepts of rotary junction bottlenecks corresponding to edge colony boundaries, of lane changes corresponding to c-axis redistribution within colonies, and on-ramps corresponding to tilted and bent grains.
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