New aspect of low-temperature phase transitions of La-cuprates

被引：0
作者：
Y. Horibe
Y. Inoue
Y. Koyama
机构：
[1] Waseda University,Department of Materials Science and Engineering
[2] Nissan ARC Ltd.,Structural Analysis Section, Research Department
[3] Waseda University,Kagami Memorial laboratory for Materials Science and Technology, and Advanced Research Center for Science and Engineering
来源：
Journal of Superconductivity | 1997年 / 10卷
关键词：
La-cuprates; phase transition; transmission electron microscopy;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The change in the microstructure on aging at 12 K below a low-temperature structural phase transition in La1.5Sr0.1Nd0.4CuO4 has been examined by transmission electron microscopy. From a seriesof 100 forbidden dark field images obtained inin situ observation, spotty-shape regions with a Pccn/LTT tilt of the CuO6 octahedron were found to be nucleated and grow inside a LTO domain, accompanying the annihilation of some spotty-shape regions. In addition, there exists a tweed texture in fundamental dark field images, which is due to the macroscopic strain involved in the transition. Because a mapof the tweed texture is different from that of the spotty-shape region, the tilt of the octahedron is not always coupled to a proper spontaneous strain.
引用
收藏
页码：461 / 466
页数：5
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