Journal
APL MATERIALS
Volume 2, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4865160
Keywords
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- U. S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
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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 Pm(3) over bar 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. (C) 2014 Author(s).
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