Abstract
Abstract
As one of the most ubiquitous lattice distortions in complex transition metal oxides, oxygen octahedral rotation/tilting plays an important role in their physical properties. In this paper, we report the evolution of oxygen octahedral tilting in La2/3Ca1/3MnO3 films grown on NdGaO3 substrates with different orientations by using an aberration-corrected scanning transmission electron microscope. Different epitaxial strains depending on the substrate orientation lead to different orientation relationships between the films and substrates. Unlike conventional coherent growth, our experimental results demonstrate that the reorientation of the oxygen octahedral tilting axis, depending on epitaxial strains, would occur at the interface between the film and substrate for the (010)-oriented substrate or inside the film for the (1-12)-oriented substrate, as well supported by theoretical calculations via density functional theory method and electron energy loss spectroscopy measurements. Considering the universality of interfacial oxygen octahedral coupling in oxide heterostructures, these experimental findings offer great insights in understanding thickness- and orientation-dependent physical properties of thin films.
Funder
National Natural Science Foundation of China
Outstanding Youth Scientist Foundation of Hunan Province
Subject
General Physics and Astronomy
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献