Oxygen-Vacancy-Induced Polar Behavior in (LaFeO3)2/(SrFeO3) Superlattices

Mishra, Rohan; Kim, Young-Min; Salafranca, Juan; Kim, Seong Keun; Chang, Seo Hyoung; Bhattacharya, Anand; Fong, Dillon D.; Pennycook, Stephen J.; Pantelides, Sokrates T.; Borisevich, Albina Y.

doi:10.1021/nl500601d

Title: Oxygen-Vacancy-Induced Polar Behavior in (LaFeO₃)₂/(SrFeO₃) Superlattices

Journal Article · Tue Apr 15 00:00:00 EDT 2014 · Nano Letters

DOI:https://doi.org/10.1021/nl500601d· OSTI ID:1357051

Mishra, Rohan ^[1]; Kim, Young-Min ^[2]; Salafranca, Juan ^[3]; Kim, Seong Keun ^[4]; Chang, Seo Hyoung ^[5]; Bhattacharya, Anand ^[5]; Fong, Dillon D. ^[5]; Pennycook, Stephen J. ^[6]; Pantelides, Sokrates T. ^[1]; Borisevich, Albina Y. ^[7]

Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Korea Basic Science Inst., Daejeon (Korea). Division of Electron Microscopic Research
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. Complutense Madrid (Spain). Complex Materials Physics Group
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Korea Inst. of Science and Technology, Seoul (Korea). Electronic Materials Research Center
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Complex oxides displaying ferroelectric and/or multiferroic behavior are of high fundamental and applied interest. In this work, for the first time, we show that it is possible to achieve polar order in a superlattice made up of two nonpolar oxides by means of oxygen vacancy ordering. Using scanning transmission electron microscopy imaging, we show the polar displacement of magnetic Fe ions in a superlattice of (LaFeO₃)₂/(SrFeO₃) grown on a SrTiO₃ substrate. Using density functional theory calculations, we systematically study the effect of epitaxial strain, octahedral rotations, and surface terminations in the superlattice and find them to have a negligible effect on the antipolar displacements of the Fe ions lying in between SrO and LaO layers of the superlattice (i.e., within La_0.5Sr_0.5FeO₃ unit cells). The introduction of oxygen vacancies, on the other hand, triggers a polar displacement of the Fe ions. We confirm this important result using electron energy loss spectroscopy, which shows partial oxygen vacancy ordering in the region where polar displacements are observed and an absence of vacancy ordering outside of that area.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; FG02-09ER46554; AC02-05CH11231; 239739; AC05-00OR22725

OSTI ID:: 1357051

Journal Information:: Nano Letters, Vol. 14, Issue 5; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 53 works

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Title: Oxygen-Vacancy-Induced Polar Behavior in (LaFeO3)2/(SrFeO3) Superlattices

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