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J Phys Condens Matter. 2018 Mar 14;30(10):105601. doi: 10.1088/1361-648X/aaab87.

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

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Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea. Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.


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.


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