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

doi:10.1063/1.4865160

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

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51 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 language	English
Article number	021102
Journal	APL Materials
Volume	2
Issue number	2
DOIs	https://doi.org/10.1063/1.4865160
State	Published - Feb 2014

ASJC Scopus subject areas

General Materials Science
General Engineering

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title = "Octahedral rotations in strained LaAlO3/SrTiO3 (001) heterostructures",

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 Pm{\=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.",

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

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T1 - Octahedral rotations in strained LaAlO3/SrTiO3 (001) heterostructures

AU - Fister, T. T.

AU - Zhou, H.

AU - Luo, Z.

AU - Seo, S. S.A.

AU - Hruszkewycz, S. O.

AU - Proffit, D. L.

AU - Eastman, J. A.

AU - Fuoss, P. H.

AU - Baldo, P. M.

AU - Lee, H. N.

AU - Fong, D. D.

PY - 2014/2

Y1 - 2014/2

N2 - 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.

AB - 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.

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Octahedral rotations in strained LaAlO₃/SrTiO₃ (001) heterostructures

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