Antiferroelectricity in Oxides: A Reexamination

Rabe, Karin M.

doi:10.1002/9783527654864.ch7

Cited by 109 publications

(128 citation statements)

References 124 publications

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“…They tend to form following a distortion from one symmetric phase to a less symmetric phase accompanied by an anomaly in the dielectric permittivity related to the formation and/or organization of local dipole moments in an AF arrangement. This can also involve a doubling of the cell parameters when the associated soft phonon modes feature two groups of displacements, equal and opposite in magnitude [27,28]. The basic theoretical description of these AFEs is therefore one with two (or multiples of two) equivalent and opposing polarized sublattices [29].…”

Section: Dielectric and Polarization Propertiesmentioning

confidence: 99%

“…The basic theoretical description of these AFEs is therefore one with two (or multiples of two) equivalent and opposing polarized sublattices [29]. The application of a sufficiently large electric field along the dipolar axis is expected to invert the polarization of the opposing sublattice, forming an induced ferroelectric state, and leading to a characteristic hysteresis loop in the electrical polarization as a function of the electric field [26,27]. The P cmn phase in CBSCl is consistent with the transition at T S from a paralelectric (PE) phase to an AFE state as described above.…”

Section: Dielectric and Polarization Propertiesmentioning

confidence: 99%

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Magnetic and dielectric order in the kagomelike francisite Cu3Bi(SeO3)2O2Cl

et al. 2017

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We report a single-crystal neutron diffraction and inelastic neutron scattering study on the spin 1/2 cuprate Cu3Bi(SeO3)2O2Cl, complemented by dielectric and electric polarization measurements. The study clarifies a number of open issues concerning this complex material, whose frustrated interactions on a kagome-like lattice, combined with Dzyaloshinskii-Moriya interactions, are expected to stabilize an exotic canted antiferromagnetic order. In particular, we determine the nature of the structural transition occurring at 115 K, the magnetic structure below 25 K resolved in the updated space group, and the microscopic ingredients at the origin of this magnetic arrangement. This was achieved by an analysis of the measured gapped spin waves, which signifies the need of an unexpected and significant anisotropic exchange beyond the proposed Dzyaloshinskii-Moriya interactions. Finally, we discuss the mutliferroic properties of this material with respect to the space group symmetries.

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Section: Dielectric and Polarization Propertiesmentioning

confidence: 99%

Section: Dielectric and Polarization Propertiesmentioning

confidence: 99%

Magnetic and dielectric order in the kagomelike francisite Cu3Bi(SeO3)2O2Cl

et al. 2017

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“…12 Antipolar systems are important compounds on their own. For instance, the Pnma state in ABO 3 perovskites is known to possess antipolar motions of its A cations and recent studies found that it can also adopt the double polarization-vs.-electric field hysteresis loop in some materials 13,14 that is characteristics of antiferroelectrics 15 -therefore suggesting that Pnma states in some perovskites can hold promise towards the design of energy storage devices with high energy densities and efficiencies. [16][17][18][19][20][21][22] Interestingly, all the aforementioned works on trilinear energetic couplings have been aimed at revealing and understanding resulting static properties.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of antipolar distortions

2017

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Materials possessing antipolar cation motions are currently receiving a lot of attention because they are fundamentally intriguing while being technologically promising. Most studies devoted to these complex materials have focused on their static properties or on their zone-center phonons. As a result, some important dynamics of antipolar cation distortions, such as the temperature behavior of their phonon frequencies, have been much less investigated, despite the possibility to exhibit unusual features. Here, we report the results and analysis of atomistic simulations revealing and explaining such dynamics for BiFeO 3 bulks being subject to hydrostatic pressure. It is first predicted that cooling such material yields the following phase transition sequence: the cubic paraelectric Pm3m state at high temperature, followed by an intermediate phase possessing long-range-ordered in-phase oxygen octahedral tiltings, and then the Pnma state that is known to possess antipolar cation motions in addition to in-phase and antiphase oxygen octahedral tiltings. Antipolar cation modes are found to all have high phonon frequencies that are independent of temperature in the paraelectric phase. On the other hand and in addition to antipolar cation modes increasing in number, some phonons possessing antipolar cation character are rather soft in the intermediate and Pnma states. Analysis of our data combined with the development of a simple model reveals that such features originate from a dynamical mixing between pure antipolar cation phonons and fluctuations of oxygen octahedral tiltings, as a result of a specific trilinear energetic coupling. The developed model can also be easily applied to predict dynamics of antipolar cation motions for other possible structural paths bringing Pm3m to Pnma states.

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“…Antiferroelectricity has attracted great attention recently not only due to its potential applicability in various fields but also due to its relation to the fundamental physics of phase transitions [1].…”

Section: Introductionmentioning

confidence: 99%

Elastic anomalies associated with the antiferroelectric phase transitions of PbHfO3 single crystals

Roleder

Majchrowski

et al. 2014

Journal of the Korean Physical Society

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The temperature dependence of the elastic properties of antiferroelectric PbHfO3 was investigated by Brillouin scattering. The two structural phase transitions of antiferroelectric-antiferroelectricparaelectric phases were clearly identified by discontinuous changes in the acoustic mode frequencies and the hypersonic damping. The substantial softening of the mode frequency along with the remarkable increase in the acoustic damping observed in the paraelectric phase indicated the formation of precursor noncentrosymmetric (polar) clusters and their coupling to the acoustic waves. This was corroborated by the observation of quasi-elastic central peaks, the intensity of which grew upon cooling toward the Curie point. The obtained relaxation time exhibited a slowing-down behavior, suggesting that the dynamics of precursor clusters becomes more sluggish on approaching the phase transition temperature. 2PACS numbers: 78.35.+c, 62.50.+p

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Antiferroelectricity in Oxides: A Reexamination

Cited by 109 publications

References 124 publications

Magnetic and dielectric order in the kagomelike francisite Cu3Bi(SeO3)2O2Cl

Magnetic and dielectric order in the kagomelike francisite Cu3Bi(SeO3)2O2Cl

Dynamics of antipolar distortions

Elastic anomalies associated with the antiferroelectric phase transitions of PbHfO3 single crystals

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