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

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

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6 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 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.

Original languageEnglish (US)
Article number10PB02
JournalJapanese Journal of Applied Physics
Volume56
Issue number10
DOIs
StatePublished - Oct 2017

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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