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

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 TN=65 - 130 K. Despite its critical relevance to the intriguing ferroelectric domain physics, the details of the ferroelectric transition are yet 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.

arXiv comment15 pages, 6 figures

References in corpus (8)

• The ferroelectric transition in YMnO${}_3$ from first principles
• The High Temperature Phase Transitions of Hexagonal YMnO3
• Direct observation of the proliferation of ferroelectric loop domains and vortex-antivortex pairs
• Topological defects as relics of emergent continuous symmetry and Higgs condensation of disorder in ferroelectrics
• Spontaneous decays of magneto-elastic excitations in noncollinear antiferromagnet (Y,Lu)MnO3
• Observation of persistent centrosymmetricity in the hexagonal manganite family
• Hexagonal RMnO${}_3$: a model system for 2D triangular lattice antiferromagnets
• High-resolution structure studies and magnetoelectric coupling of relaxor multiferroic Pb(Fe${}_{0.5}$Nb${}_{0.5}$)O${}_3$

Cited by in corpus (3)

• Unconventional order-disorder phase transition in improper ferroelectric hexagonal manganites
• Single-crystal neutron diffraction study of hexagonal YbMnO${}_3$ multiferroic under magnetic field
• Strain-Driven Structure-Ferroelectricity Relationship in hexagonal TbMnO${}_3$ Films