Direct observation of charged domain walls in hybrid improper ferroelectric (Ca,Sr)<sub>3</sub>Ti<sub>2</sub>O<sub>7</sub>
説明
We investigated ferroelectric (FE) domain wall structures including "charged domain walls" of hybrid improper FE (Ca,Sr)3Ti2O7 at the subatomic resolution by dark-field transmission electron microscopy (TEM) and high-resolution state-of-the-art aberration-corrected high-angle annular-dark-field (HAADF) scanning transmission electron microscopy (STEM). Dark-field TEM and high-resolution HAADF-STEM images obtained in the FE phase of single crystals of Ca2.46Sr0.54Ti2O7 revealed the formation of abundant charged domain walls with the head-to-head and tail-to-tail configurations in the FE domain structure, in addition to the FE 180° domain structure. The charged domain walls with the head-to-head and tail-to-tail FE polarizations exist stably and can be characterized as the unique double arc-type displacement of Ca/Sr ions in a unit cell without charge accumulation.
収録刊行物
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- Japanese Journal of Applied Physics
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Japanese Journal of Applied Physics 56 (10S), 10PB02-, 2017-09-08
IOP Publishing
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詳細情報 詳細情報について
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- CRID
- 1360565171312984960
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- NII論文ID
- 210000148349
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- ISSN
- 13474065
- 00214922
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
