A geometrical rationalization of the special properties of the 14° [001] grain boundary in YBa2Cu3O7−&dgr;
作者:
A. H. King,
Abha Singh,
期刊:
Journal of Applied Physics
(AIP Available online 1993)
卷期:
Volume 74,
issue 7
页码: 4627-4630
ISSN:0021-8979
年代: 1993
DOI:10.1063/1.354382
出版商: AIP
数据来源: AIP
摘要:
14° [001] tilt grain boundaries in YBa2Cu3O7−&dgr;have been found to exhibit anomalously good superconducting critical currents, associated with magnetic flux pinning, although no special interfacial structure has heretofore been associated with this misorientation. We present an analysis of the geometry of the grain boundary in question and show that it can correspond to a special interface, within the definition of constrained lattice coincidence, which may lead to new understanding of the superconducting behavior of grain boundaries. Our analysis shows that the tetragonal‐to‐orthorhombic phase transformation may have important effects upon grain boundary structure and properties, indicating new approaches to producing high‐current superconductors.
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