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- 저자 : Salafranca, Juan (검색결과 1 건)
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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. American Chemical Society 2014 NANO LETTERS Vol.14 No.5
<P>Complex oxides displaying ferroelectric and/or multiferroic behavior are of high fundamental and applied interest. In this work, 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 (LaFeO<SUB>3</SUB>)<SUB>2</SUB>/(SrFeO<SUB>3</SUB>) grown on a SrTiO<SUB>3</SUB> 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<SUB>0.5</SUB>Sr<SUB>0.5</SUB>FeO<SUB>3</SUB> 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.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-5/nl500601d/production/images/medium/nl-2014-00601d_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl500601d'>ACS Electronic Supporting Info</A></P>
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