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Stabilizing hidden room-temperature ferroelectricity via a metastable atomic distortion pattern

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Title
Stabilizing hidden room-temperature ferroelectricity via a metastable atomic distortion pattern
Author(s)
Jeong Rae Kim; Jinhyuk Jang; Kyoung-June Go; Se Young Park; Chang Jae Roh; John Bonini; Jinkwon Kim.; Han Gyeol Lee; Karin M. Rabe; Jong Seok Lee; Si-Young Choi; Tae Won Noh; Daesu Lee
Subject
HETEROSTRUCTURES, ; PEROVSKITES, ; POLARIZATION, ; DYNAMICS, ; CRYSTAL, ; CATIO3
Publication Date
2020-12
Journal
NATURE COMMUNICATIONS, v.11, no.1, pp.4944
Publisher
NATURE PUBLISHING GROUP
Abstract
© 2020, The Author(s). Nonequilibrium atomic structures can host exotic and technologically relevant properties in otherwise conventional materials. Oxygen octahedral rotation forms a fundamental atomic distortion in perovskite oxides, but only a few patterns are predominantly present at equilibrium. This has restricted the range of possible properties and functions of perovskite oxides, necessitating the utilization of nonequilibrium patterns of octahedral rotation. Here, we report that a designed metastable pattern of octahedral rotation leads to robust room-temperature ferroelectricity in CaTiO3, which is otherwise nonpolar down to 0 K. Guided by density-functional theory, we selectively stabilize the metastable pattern, distinct from the equilibrium pattern and cooperative with ferroelectricity, in heteroepitaxial films of CaTiO3. Atomic-scale imaging combined with deep neural network analysis confirms a close correlation between the metastable pattern and ferroelectricity. This work reveals a hidden but functional pattern of oxygen octahedral rotation and opens avenues for designing multifunctional materials
URI
https://pr.ibs.re.kr/handle/8788114/7524
DOI
10.1038/s41467-020-18741-w
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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