Studies on the high-temperature ferroelectric transition of multiferroic hexagonal manganite RMnO3

Hasung Sim, Jaehong Jeong, Haeri Kim, Sang-Wook Cheong, Je Geun Park

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Abstract

Hexagonal manganites are multiferroic materials with two highly-dissimilar phase transitions: a ferroelectric transition (from P63/mmc to P63cm) at a temperature higher than 1000 K and an antiferromagnetic transition at T N = 65-130 K. Despite its critical relevance to the intriguing ferroelectric domain physics, the details of the ferroelectric transition are not well known to date primarily because of the ultra-high transition temperature. Using high-temperature x-ray diffraction experiments, we show that the ferroelectric transition is a single transition of abrupt order and R-Op displacement is the primary order parameter. This structural transition is then simultaneously accompanied by MnO5 tilting and the subsequent development of electric polarization.

Original languageEnglish (US)
Article number105601
JournalJournal of Physics Condensed Matter
Volume30
Issue number10
DOIs
StatePublished - Feb 15 2018

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • ferroelectric transition
  • hexagonal manganite
  • multiferroic

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