Oxygen lattice disorder in YBa2Cu3Oxepitaxial films with enlarged c-axis lattice parameter

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Abstract
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 oxygen deficit in the Cu-O chains or (Y,Ba) cation disorder. A bridging oxygen disorder model shows qualitative agreement with experimental X-ray diffraction spectra. Thermodynamic analysis of the formation of oxygen vacancies shows the high theoretical density of the bridging oxygen vacancies at the film synthesis temperatures.