Octahedral rotations in strained LaAlO3/SrTiO3 (001) heterostructures
Source abstract
Abstract
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}Pm3¯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.
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Research context
OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Ferroelectric and Piezoelectric Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Argonne National Laboratory 1 Materials Science Division, , Argonne, Illinois 60439, USA
Argonne National Laboratory 2 X-Ray Science Division, Advanced Photon Source, , Argonne, Illinois 60439, USA
University of Science and Technology of China 3 National Synchrotron Radiation Laboratory, , Hefei 230029, China
Oak Ridge National Laboratory 4 Materials Science and Technology Division, , Oak Ridge, Tennessee 37831, USA
Funding
DOE
References (58)
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