Octahedral rotations in strained LaAlO3/SrTiO3 (001) heterostructures

T. T. Fister, H. Zhou, Z. Luo, S. S.A. Seo, S. O. Hruszkewycz, D. L. Proffit, J. A. Eastman, P. H. Fuoss, P. M. Baldo, H. N. Lee, D. D. Fong

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

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 Pm3̄m 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.

Original languageEnglish
Article number021102
JournalAPL Materials
Volume2
Issue number2
DOIs
StatePublished - Feb 2014

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering

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