Scientific article

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

Published inSuperconductor Science and Technology, vol. 8, no. 10, p. 764-768
Publication date1995

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 (μ₀H<0.1 T) followed by a slow exponential decay at higher fields. This kind of amorphous layer is likely to be insulating, and this strongly suggests that Jc 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.

Citation (ISO format)
LI, Y.H. et al. “Brick wall” or “rail switch”: the role of low-angle <i>ab</i>-axis grain boundaries in critical current of BSCCO tapes. In: Superconductor Science and Technology, 1995, vol. 8, n° 10, p. 764–768. doi: 10.1088/0953-2048/8/10/004
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Article (Published version)
ISSN of the journal0953-2048

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