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Hrem on Grain Boundaries in Oxide Superconductors

Published online by Cambridge University Press:  21 February 2011

H.W. Zandbergenl  and
G. van Tendeloo
H.W. Zandbergenl
Affiliation:
Center for HREM, Laboratory of Materials Sciences, Rotterdamseweg 137, 2628 AL Delft, The Netherlands Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands.
G. van Tendeloo
Affiliation:
Center for EM, University of Antwerp, RUCA, Groenenborgerlaan 171, Antwerp, Belgium.
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Abstract

High resolution electron microscopy has been carried out on grain boundaries in a number of superconducting oxides: YBa2Cu3O77−∂, LaCaBaCu3O7−∂, Bi2Sr2CanCun+1O2n+6+∂, and Pb2(Sr, Ca)3−xAxCu2+nO6+2n+∂. In general no amorphous material or another phase is observed at the grain boundaries. It is argued that the low critical currents in these polycrystalline materials are caused by the atomic structure of (001) interfaces at grain boundaries and concerning YBa2Cu3O7 and LaCaBaCu3O7−∂ by the intercalation of CuO layers starting from the grain boundaries.

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References

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