Stabilization of Highly Polar BiFeO_{3}-like Structure: A New Interface Design Route for Enhanced Ferroelectricity in Artificial Perovskite Superlattices
In ABO_{3} perovskites, oxygen octahedron rotations are common structural distortions that can promote large ferroelectricity in BiFeO_{3} with an R3c structure [1] but suppress ferroelectricity in CaTiO_{3} with a Pbnm symmetry [2]. For many CaTiO_{3}-like perovskites, the BiFeO_{3} structure is a...
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2016-03-01
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Series: | Physical Review X |
Online Access: | http://doi.org/10.1103/PhysRevX.6.011027 |
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doaj-6714800837fb4ba2afe0eff64e120c3f2020-11-25T02:31:36ZengAmerican Physical SocietyPhysical Review X2160-33082016-03-016101102710.1103/PhysRevX.6.011027Stabilization of Highly Polar BiFeO_{3}-like Structure: A New Interface Design Route for Enhanced Ferroelectricity in Artificial Perovskite SuperlatticesHongwei WangJianguo WenDean J. MillerQibin ZhouMohan ChenHo Nyung LeeKarin M. RabeXifan WuIn ABO_{3} perovskites, oxygen octahedron rotations are common structural distortions that can promote large ferroelectricity in BiFeO_{3} with an R3c structure [1] but suppress ferroelectricity in CaTiO_{3} with a Pbnm symmetry [2]. For many CaTiO_{3}-like perovskites, the BiFeO_{3} structure is a metastable phase. Here, we report the stabilization of the highly polar BiFeO_{3}-like phase of CaTiO_{3} in a BaTiO_{3}/CaTiO_{3} superlattice grown on a SrTiO_{3} substrate. The stabilization is realized by a reconstruction of oxygen octahedron rotations at the interface from the pattern of nonpolar bulk CaTiO_{3} to a different pattern that is characteristic of a BiFeO_{3} phase. The reconstruction is interpreted through a combination of amplitude-contrast sub-0.1-nm high-resolution transmission electron microscopy and first-principles theories of the structure, energetics, and polarization of the superlattice and its constituents. We further predict a number of new artificial ferroelectric materials demonstrating that nonpolar perovskites can be turned into ferroelectrics via this interface mechanism. Therefore, a large number of perovskites with the CaTiO_{3} structure type, which include many magnetic representatives, are now good candidates as novel highly polar multiferroic materials [3].http://doi.org/10.1103/PhysRevX.6.011027 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hongwei Wang Jianguo Wen Dean J. Miller Qibin Zhou Mohan Chen Ho Nyung Lee Karin M. Rabe Xifan Wu |
spellingShingle |
Hongwei Wang Jianguo Wen Dean J. Miller Qibin Zhou Mohan Chen Ho Nyung Lee Karin M. Rabe Xifan Wu Stabilization of Highly Polar BiFeO_{3}-like Structure: A New Interface Design Route for Enhanced Ferroelectricity in Artificial Perovskite Superlattices Physical Review X |
author_facet |
Hongwei Wang Jianguo Wen Dean J. Miller Qibin Zhou Mohan Chen Ho Nyung Lee Karin M. Rabe Xifan Wu |
author_sort |
Hongwei Wang |
title |
Stabilization of Highly Polar BiFeO_{3}-like Structure: A New Interface Design Route for Enhanced Ferroelectricity in Artificial Perovskite Superlattices |
title_short |
Stabilization of Highly Polar BiFeO_{3}-like Structure: A New Interface Design Route for Enhanced Ferroelectricity in Artificial Perovskite Superlattices |
title_full |
Stabilization of Highly Polar BiFeO_{3}-like Structure: A New Interface Design Route for Enhanced Ferroelectricity in Artificial Perovskite Superlattices |
title_fullStr |
Stabilization of Highly Polar BiFeO_{3}-like Structure: A New Interface Design Route for Enhanced Ferroelectricity in Artificial Perovskite Superlattices |
title_full_unstemmed |
Stabilization of Highly Polar BiFeO_{3}-like Structure: A New Interface Design Route for Enhanced Ferroelectricity in Artificial Perovskite Superlattices |
title_sort |
stabilization of highly polar bifeo_{3}-like structure: a new interface design route for enhanced ferroelectricity in artificial perovskite superlattices |
publisher |
American Physical Society |
series |
Physical Review X |
issn |
2160-3308 |
publishDate |
2016-03-01 |
description |
In ABO_{3} perovskites, oxygen octahedron rotations are common structural distortions that can promote large ferroelectricity in BiFeO_{3} with an R3c structure [1] but suppress ferroelectricity in CaTiO_{3} with a Pbnm symmetry [2]. For many CaTiO_{3}-like perovskites, the BiFeO_{3} structure is a metastable phase. Here, we report the stabilization of the highly polar BiFeO_{3}-like phase of CaTiO_{3} in a BaTiO_{3}/CaTiO_{3} superlattice grown on a SrTiO_{3} substrate. The stabilization is realized by a reconstruction of oxygen octahedron rotations at the interface from the pattern of nonpolar bulk CaTiO_{3} to a different pattern that is characteristic of a BiFeO_{3} phase. The reconstruction is interpreted through a combination of amplitude-contrast sub-0.1-nm high-resolution transmission electron microscopy and first-principles theories of the structure, energetics, and polarization of the superlattice and its constituents. We further predict a number of new artificial ferroelectric materials demonstrating that nonpolar perovskites can be turned into ferroelectrics via this interface mechanism. Therefore, a large number of perovskites with the CaTiO_{3} structure type, which include many magnetic representatives, are now good candidates as novel highly polar multiferroic materials [3]. |
url |
http://doi.org/10.1103/PhysRevX.6.011027 |
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