Polarization rotation by external electric field in the two-dimensional antiferroelectric squaric acid H2 C4 O4

A pseudospin model for description of the influence of the electric field, confined to the plane of sublattice polarization, on the two-dimensional squaric acid antiferroelectrics is developed. The temperature–electric field T−E1 phase diagram is constructed. Most of the field-induced transitions ar...

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Published in:Physical review. B 2021-06, Vol.103 (21)
Main Author: Moina, A P
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Language:English
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Antiferroelectricity
Electric fields
Low temperature
Phase diagrams
Polarization
Rotation
Two dimensional models
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description A pseudospin model for description of the influence of the electric field, confined to the plane of sublattice polarization, on the two-dimensional squaric acid antiferroelectrics is developed. The temperature–electric field T−E1 phase diagram is constructed. Most of the field-induced transitions are found to be associated with polarization rotation. The system behavior is best characterized by the introduced noncollinearity angle θ , which is the angle between the sublattice polarizations. The collinear ferroelectric phase and two noncollinear phases with almost antiparallel and perpendicular polarizations of the sublattices are identified. The diagram also contains the crossover region, where the noncollinearity angle varies continuously between, nominally, 180 ∘ and 90 ∘ . The first- and second-order transition lines, supercritical lines, critical and two bicritical end points, and the tricritical point on the T−E1 phase diagram are detected. Three plateaus are observed in the field dependence of the net polarization at low temperatures.
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subjects Antiferroelectricity
Electric fields
Low temperature
Phase diagrams
Polarization
Rotation
Two dimensional models
title Polarization rotation by external electric field in the two-dimensional antiferroelectric squaric acid H2 C4 O4
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