'Brick wall' or 'rail switch' the role of low-angle ab-axis grain boundaries in critical current of BSCCO tapes

1 October 1995

journal article
Published by IOP Publishing in Superconductor Science and Technology

Vol. 8 (10) , 764-768
https://doi.org/10.1088/0953-2048/8/10/004

Abstract

TEM studies of a Bi-2223 tape have shown that amorphous layers from about 10 nm to more than 100 nm in width were present at c-axis twist boundaries in the highly textured Bi-2223 tape which showed a limited residual weak-link field dependence at low fields ( mu ₀Hc is not limited by c-axis current transport as proposed by the 'brick wall' model. The most frequently observed low-angle grain boundaries are ab-axis grain boundaries containing no (001) planes. A modified 'rail switch' model was proposed with low-angle ab-axis grain boundaries at the switches rather than low-angle c-axis grain boundaries as suggested by Hensel et al.

Keywords

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