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Improper electric polarization in simple perovskite oxides with two magnetic sublattices

ABO(3) perovskite oxides with magnetic A and B cations offer a unique playground to explore interactions involving two spin sublattices and the emergent effects they may drive. Of particular interest is the possibility of having magnetically driven improper ferroelectricity, as in the much studied f...

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Autores principales: Zhao, Hong Jian, Bellaiche, L., Chen, Xiang Ming, Íñiguez, Jorge
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5263889/
https://www.ncbi.nlm.nih.gov/pubmed/28106057
http://dx.doi.org/10.1038/ncomms14025
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author Zhao, Hong Jian
Bellaiche, L.
Chen, Xiang Ming
Íñiguez, Jorge
author_facet Zhao, Hong Jian
Bellaiche, L.
Chen, Xiang Ming
Íñiguez, Jorge
author_sort Zhao, Hong Jian
collection PubMed
description ABO(3) perovskite oxides with magnetic A and B cations offer a unique playground to explore interactions involving two spin sublattices and the emergent effects they may drive. Of particular interest is the possibility of having magnetically driven improper ferroelectricity, as in the much studied families of rare-earth orthoferrites and orthochromites; yet, the mechanisms behind such effects remain to be understood in detail. Here we show that the strongest polar order corresponds to collinear spin configurations and is driven by non-relativistic exchange-strictive mechanisms. Our first-principles simulations reveal the dominant magnetostructural couplings underlying the observed ferroelectricity, including a striking magnetically driven piezoelectric effect. Further, we derive phenomenological and atomistic theories that describe such couplings in a generic perovskite lattice. This allows us to predict how the observed effects can be enhanced, and even how similar ones can be obtained in other perovskite families.
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spelling pubmed-52638892017-02-03 Improper electric polarization in simple perovskite oxides with two magnetic sublattices Zhao, Hong Jian Bellaiche, L. Chen, Xiang Ming Íñiguez, Jorge Nat Commun Article ABO(3) perovskite oxides with magnetic A and B cations offer a unique playground to explore interactions involving two spin sublattices and the emergent effects they may drive. Of particular interest is the possibility of having magnetically driven improper ferroelectricity, as in the much studied families of rare-earth orthoferrites and orthochromites; yet, the mechanisms behind such effects remain to be understood in detail. Here we show that the strongest polar order corresponds to collinear spin configurations and is driven by non-relativistic exchange-strictive mechanisms. Our first-principles simulations reveal the dominant magnetostructural couplings underlying the observed ferroelectricity, including a striking magnetically driven piezoelectric effect. Further, we derive phenomenological and atomistic theories that describe such couplings in a generic perovskite lattice. This allows us to predict how the observed effects can be enhanced, and even how similar ones can be obtained in other perovskite families. Nature Publishing Group 2017-01-20 /pmc/articles/PMC5263889/ /pubmed/28106057 http://dx.doi.org/10.1038/ncomms14025 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Zhao, Hong Jian
Bellaiche, L.
Chen, Xiang Ming
Íñiguez, Jorge
Improper electric polarization in simple perovskite oxides with two magnetic sublattices
title Improper electric polarization in simple perovskite oxides with two magnetic sublattices
title_full Improper electric polarization in simple perovskite oxides with two magnetic sublattices
title_fullStr Improper electric polarization in simple perovskite oxides with two magnetic sublattices
title_full_unstemmed Improper electric polarization in simple perovskite oxides with two magnetic sublattices
title_short Improper electric polarization in simple perovskite oxides with two magnetic sublattices
title_sort improper electric polarization in simple perovskite oxides with two magnetic sublattices
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5263889/
https://www.ncbi.nlm.nih.gov/pubmed/28106057
http://dx.doi.org/10.1038/ncomms14025
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AT iniguezjorge improperelectricpolarizationinsimpleperovskiteoxideswithtwomagneticsublattices