Oxygen Lattice Disorder in YBa sub 2 Cu sub 3 O sub x Epitaxial Films With Enlarged c-Axis Lattice Parameter

The behaviour of the crystal structure of the YBCO epitaxial films with enlarged c-axis parameter has been studied. The c-axis expansion effect is shown to be induced by low oxygen partial pressure during the film deposition. This effect cannot be explained only by O deficit in the Cu--O chains or (...

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Published in:Superconductor science & technology 1992-05, Vol.5 (5), p.283-289
Main Authors: Shapovalov, A P, Boguslavskij, Y M, Ruban, A I, Gridneva, G G, Melnikov, V S, Pshentsova, N P
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container_start_page 283
container_title Superconductor science & technology
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creator Shapovalov, A P
Boguslavskij, Y M
Ruban, A I
Gridneva, G G
Melnikov, V S
Pshentsova, N P
description The behaviour of the crystal structure of the YBCO epitaxial films with enlarged c-axis parameter has been studied. The c-axis expansion effect is shown to be induced by low oxygen partial pressure during the film deposition. This effect cannot be explained only by O deficit in the Cu--O chains or (yttrium, Ba) cation disorder. A bridging O disorder model shows qualitative agreement with experimental X-ray diffraction spectra. Thermodynamic analysis of the formation of O vacancies shows the high theoretical density of the bridging O vacancies at the film synthesis temperatures.
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title Oxygen Lattice Disorder in YBa sub 2 Cu sub 3 O sub x Epitaxial Films With Enlarged c-Axis Lattice Parameter
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