Domain structures and superdislocations of La0.7Ca0.3MnO3 thin films grown on SrTiO3 substrates

Physics – Condensed Matter – Materials Science

Scientific paper

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19 pages, 6 figures

Scientific paper

10.1016/j.jcrysgro.2007.05.033

The domain structures and dislocations in epitaxial thin films of La0.7Ca0.3MnO3 grown on SrTiO3 substrates by pulsed laser deposition were investigated using Bragg-contrast diffraction and high-resolution transmission electron microscopy. It revealed that the films contained the 1/2[100]o and 1/2[10-1]o types partial threading dislocations, the 90 degree - and 120 degree - types of twin- domain boundaries, and two types 1/2[010]o, 1/2[111]o, of antiphase boundaries, which are often observed in bulk materials. In addition, two types of superdislocations were detected; one consisted of two 1/2[111]o dislocations and a 1/2[111]o antiphase boundary, and the other was composed of two 1/2[010]o dislocations and a 1/2[010]o antiphase boundary. These superdislocations, domain boundaries, and their relationships were extensively explored.

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