Oxygen octahedron reconstruction in the SrTiO3/LaAlO3 heterointerfaces investigated using aberration-corrected ultrahigh-resolution transmission electron microscopy
Oxygen octahedron reconstruction in the SrTiO3/LaAlO3 heterointerfaces investigated using aberration-corrected ultrahigh-resolution transmission electron microscopy
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DOI：
10.1103/physrevb.79.081405
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发表时间：
2009-02-01
影响因子：
3.7
通讯作者：
Urban, K.
中科院分区：
文献类型：
--
作者：
Jia, C. L.;Mi, S. B.;Urban, K.
我们研究了LaAlO3/SrTiO3界面，通过像差校正的超高分辨率透射电子显微镜，使我们能够以几皮米的精度测量界面中的单个原子位移。我们发现，在原立方SrTiO3层中，正方面体LaAlO3的氧八面体旋转也在界面上发生。八面体畸变导致界面形成类铁电偶极子，外加阳离子混合修饰。
We investigate the LaAlO3/SrTiO3 interface by means of aberration-corrected ultrahigh-resolution transmission electron microscopy allowing us to measure the individual atomic shifts in the interface at a precision of a few picometers. We find that the oxygen octahedron rotation typical for rhombohedral LaAlO3 is across the interface and is also induced in the originally cubic SrTiO3 layer. Octahedra distortion leads to ferroelectricitylike dipole formation in the interface which is in addition modified by cation intermixing.