Domain structures and superdislocations of La_0.7Ca_0.3MnO₃ thin films grown on SrTiO₃ substrates

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• 作者：Yong Ding ; Jiaqing He
• 关键词：A1. Transmission electron microscopy ; A1 Defects ; A3. Thin films ; B1. La_0.7Ca_0.3MnO₃.
• 刊名：Journal of Crystal Growth
• 出版年：2007
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：15 August 2007
• 卷：306
• 期：2
• 页码：437-443
• 文件大小：1753 K

摘要

The domain structures and dislocations in epitaxial thin films of La_0.7Ca_0.3MnO₃ grown on SrTiO₃ substrates by pulsed laser deposition were investigated using transmission electron microscopy. It revealed that the films contained the and types partial threading dislocations, the 90°- and 120°-types of twin-domain boundaries, and two types , , of antiphase boundaries, which are often observed in bulk materials. In addition, two types of superdislocations were detected; one consisted of two dislocations and a antiphase boundary, and the other was composed of two dislocations and a antiphase boundary. These superdislocations, domain boundaries, and their relationships were extensively explored.