Studies on the high-temperature ferroelectric transition of multiferroic hexagonal manganite RMnO3. (15th February 2018)

• Record Type: Journal Article
• Authors: Sim, Hasung; Jeong, Jaehong; Kim, Haeri; Cheong, S-W; Park, Je-Geun
• Is Part Of: Journal of physics. Volume 30:Number 10(2018)
• Publication Date: 2018-02-15
• Subjects: multiferroic -- ferroelectric transition -- hexagonal manganite; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aaab87
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Hexagonal manganites are multiferroic materials with two highly-dissimilar phase transitions: a ferroelectric transition (from P63 /mmc to P63 cm) 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.