Direct observation of charged domain walls in hybrid improper ferroelectric (Ca,Sr)3Ti2O7

Kousuke Kurushima; Wataru Yoshimoto; Yui Ishii; Sang Wook Cheong; Shigeo Mori

doi:10.7567/JJAP.56.10PB02

Direct observation of charged domain walls in hybrid improper ferroelectric (Ca,Sr)₃Ti₂O₇

Kousuke Kurushima, Wataru Yoshimoto, Yui Ishii, Sang Wook Cheong, Shigeo Mori

School of Arts and Sciences, New High Energy Theory Center

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

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-darkfield (HAADF) scanning transmission electron microscopy (STEM). Dark-field TEM and high-resolution HAADF-STEM images obtained in the FE phase of single crystals of Ca_2.46Sr_0.54Ti₂O₇ 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-totail 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.

Original language	English (US)
Article number	10PB02
Journal	Japanese Journal of Applied Physics
Volume	56
Issue number	10
DOIs	https://doi.org/10.7567/JJAP.56.10PB02
State	Published - Oct 2017

All Science Journal Classification (ASJC) codes

General Engineering
General Physics and Astronomy

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title = "Direct observation of charged domain walls in hybrid improper ferroelectric (Ca,Sr)3Ti2O7",

abstract = "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-darkfield (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-totail 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.",

author = "Kousuke Kurushima and Wataru Yoshimoto and Yui Ishii and Cheong, {Sang Wook} and Shigeo Mori",

note = "Publisher Copyright: {\textcopyright} 2017 The Japan Society of Applied Physics.",

year = "2017",

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language = "English (US)",

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T1 - Direct observation of charged domain walls in hybrid improper ferroelectric (Ca,Sr)3Ti2O7

AU - Kurushima, Kousuke

AU - Yoshimoto, Wataru

AU - Ishii, Yui

AU - Cheong, Sang Wook

AU - Mori, Shigeo

PY - 2017/10

Y1 - 2017/10

N2 - 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-darkfield (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-totail 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.

AB - 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-darkfield (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-totail 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.

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Direct observation of charged domain walls in hybrid improper ferroelectric (Ca,Sr)₃Ti₂O₇

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