Octahedral rotations in strained LaAlO3/SrTiO3 (001) heterostructures

Many complex oxides display an array of structural instabilities often tied to altered electronic behavior. For oxide heterostructures, several different interfacial effects can dramatically change the nature of these instabilities. Here, we investigate LaAlO3/SrTiO3 (001) heterostructures using syn...

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Bibliographic Details
Published in:APL materials 2014-02, Vol.2 (2), p.021102-021102-9
Main Authors: Fister, T. T., Zhou, H., Luo, Z., Seo, S. S. A., Hruszkewycz, S. O., Proffit, D. L., Eastman, J. A., Fuoss, P. H., Baldo, P. M., Lee, H. N., Fong, D. D.
Format: Article
Language:English
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Summary:Many complex oxides display an array of structural instabilities often tied to altered electronic behavior. For oxide heterostructures, several different interfacial effects can dramatically change the nature of these instabilities. Here, we investigate LaAlO3/SrTiO3 (001) heterostructures using synchrotron x-ray scattering. We find that when cooling from high temperature, LaAlO3 transforms from the \documentclass[12pt]{minimal}\begin{document}$Pm\bar{3}m$\end{document} P m 3 ¯ m to the Imma phase due to strain. Furthermore, the first 4 unit cells of the film adjacent to the substrate exhibit a gradient in rotation angle that can couple with polar displacements in films thinner than that necessary for 2D electron gas formation.
ISSN:2166-532X
2166-532X
DOI:10.1063/1.4865160