Microstructural changes in epitaxial YBa2Cu3O7−δ thin films due to creation of O vacancies |
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| Authors: | Y Kuru M UsmanG Cristiani H-U Habermeier |
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| Institution: | Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany |
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| Abstract: | Structural and transport properties of YBa2Cu3O7−δ thin films subjected to different heat treatments and, consequently, having different O vacancy contents are investigated. It is observed that lattice parameters of the films follow the trend of the bulk material, indicating that either the additional stresses created in c-axis oriented films by O vacancies are negligibly small or they are relaxed at elevated temperatures. In addition, heat treatment under relatively low O2 partial pressures, used to create O vacancies, leads to considerable reduction in local variations of lattice spacings in YBa2Cu3O7−δ thin films. |
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| Keywords: | A1 Defects B2 Superconducting materials A1 X-ray diffraction A3 Physical vapor deposition processes |
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