Publication
Applied Physics Letters
Paper

Identification of epitaxial Y2O3 inclusions in sputtered YBa2Cu3O7 films: Impact on film growth

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Abstract

Y2O3 inclusions with typical sizes between 100 and 300 nm3, densely distributed (1016 cm-3) in sputtered YBa2Cu3O7 (YBCO) films on SrTiO 3 substrates, have been identified by high-resolution electron microscopy. The precipitates exhibit either cuboid or needlelike shapes and grow epitaxially within and on top of YBCO. The dominant orientation relationship corresponds to a situation where the two-dimensional lattices are nearly coincident in the interfacial (001) plane. These precipitates may contribute to the generation of screw and edge dislocations. In addition, they provide a large number of potential pinning sites for magnetic flux lines, which may contribute to the observed high critical current densities.

Date

01 Dec 1992

Publication

Applied Physics Letters

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