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Layered microdomains and columnar grains in epitaxial La0.7Ca0.3MnO3 films and Y0.7Ca0.3MnO3/La0.7Ca0.3MnO3 multilayers

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Abstract

Epitaxial La0.7Ca0.3MnO3 thin film and [Y0.7Ca0.3MnO3/La0.7Ca0.3MnO3]10 multilayers of about 140 nm in thickness were grown by pulsed laser deposition on (001)LaAlO3. Their microstructures were investigated by transmission electron microscopy and associated techniques. It was found that both the film and the multilayers contain an almost defect-free layer near the substrate, followed by columnar grain grown. The columns were separated by strained regions in the top layer. No interfacial dislocations were observed at either of the La0.7Ca0.3MnO3/LaAlO3 or the Y0.7Ca0.3MnO3/La0.7Ca0.3MnO3 interfaces. Interestingly, both the epitaxial film and the multilayers exhibited layered crystallographic domains. The formation mechanisms of the layered domain structures observed are discussed.

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Authors and Affiliations

  1. Beijing Laboratory of Electron Microscopy, Center of Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, P.O. Box 2724, Beijing, 100080, People's Republic of China

    C. J. Lu & Z. L. Wang

  2. National Mesocopic Physics State Key Laboratory and Department of Physics, Peking University, Beijing, 100871, People's Republic of China

    G. C. Xiong & G. J. Lian

  3. Department of Physics, Hubei University, Wuhan, 430062, People’s Republic of China

    C. J. Lu

  4. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA

    Z. L. Wang

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  1. C. J. Lu
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  2. Z. L. Wang
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  3. G. C. Xiong
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  4. G. J. Lian
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Lu, C.J., Wang, Z.L., Xiong, G.C. et al. Layered microdomains and columnar grains in epitaxial La0.7Ca0.3MnO3 films and Y0.7Ca0.3MnO3/La0.7Ca0.3MnO3 multilayers. Journal of Materials Research 15, 2454–2462 (2000). https://doi.org/10.1557/JMR.2000.0352

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  • DOI: https://doi.org/10.1557/JMR.2000.0352

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