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- Title
Stabilizing hidden room-temperature ferroelectricity via a metastable atomic distortion pattern.
- Authors
Kim, Jeong Rae; Jang, Jinhyuk; Go, Kyoung-June; Park, Se Young; Roh, Chang Jae; Bonini, John; Kim, Jinkwon; Lee, Han Gyeol; Rabe, Karin M.; Lee, Jong Seok; Choi, Si-Young; Noh, Tae Won; Lee, Daesu
- Abstract
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. Previous studies are limited to modulate oxygen octahedral rotation angles within the same pattern, and engineering the pattern remains a challenge. Here, the authors demonstrate a designed nonequilibrium oxygen octahedral rotation pattern leads to room-temperature ferroelectricity in CaTiO3.
- Subjects
FERROELECTRICITY; ATOMIC structure; OXYGEN; ROTATIONAL motion
- Publication
Nature Communications, 2020, Vol 11, Issue 1, pN.PAG
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-020-18741-w