Observations of charge-ordered and magnetic domains in LuFe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>using transmission electron microscopy

Maruyama, T.; Murakami, Yasukazu; Shindo, Daisuke; Abe, Noritaka; Arima, T.

doi:10.1103/physrevb.86.054202

Cited by 13 publications

(7 citation statements)

References 34 publications

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“…On the other hand, when a magnetic field forces the net moments of all bilayers to align, a stable fM-like phase with the same saturation moment should be recovered, as is indeed suggested by all macroscopic measurements (see e.g. [106,108] for corresponding phase diagrams) and by electron holography [115]. Note, however, that because of the underlying random stacking of Fe 2+ and Fe 3+ majority bilayers, this fM phase is not expected to be 3D ordered, but should rather exhibit diffuse magnetic scattering along ( 1 3 1 3 ℓ), which could be checked by in-field neutron diffraction on less-stoichiometric crystals.…”

Section: Off-stoichiometric Samples and Other Rare Earthsmentioning

confidence: 53%

Ferroelectricity from iron valence ordering in rare earth ferrites?

Angst

2013

Physica Rapid Research Ltrs

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The possibility of multiferroicity arising from charge ordering in LuFe2O4 and structurally related rare earth ferrites is reviewed. Recent experimental work on macroscopic indications of ferroelectricity and microscopic determination of coupled spin and charge order indicates that this scenario does not hold. Understanding the origin of the experimentally observed charge and spin order will require further theoretical work. Other aspects of recent research in these materials, such as geometrical frustration effects, possible electric-field-induced transitions, or orbital order are also briefly treated.Comment: 18 pages, 16 figures; invited Review@RRL, published version has many figures in significantly higher quality; early view accessible via DOI, assigned to issue

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Section: Off-stoichiometric Samples and Other Rare Earthsmentioning

confidence: 53%

Ferroelectricity from iron valence ordering in rare earth ferrites?

Angst

2013

Physica Rapid Research Ltrs

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“…Paramagnetic spectra of the LP phase are initially a superposition of equally abundant Fe 2+ and Fe 3+ doublets representing site-centered CO. There is also an electron-hopping component, Fe 2+ ⇔ Fe 3+ , initiated at CO domain boundaries at ambient pressure [28,29] (Table S1), the abundance of which increases upon compression; see Fig. 1(c).…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Coexistence of site- and bond-centered electron localization in the high-pressure phase ofLuFe2O4

et al. 2016

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Magnetic-electronic hyperfine interaction parameters of spectral components are obtained from in situ 57 Fe Mössbauer spectroscopy pressure studies of the mixed-valence LuFe 2 O 4 multiferroic, up to ∼30 GPa and on recovered high-pressure phase samples. Temperature-dependent Mössbauer spectra of the low-pressure phase show that Fe 2+ and Fe 3+ sites are discernible, consistent with known site-centered charge order in the triangular (frustrated) Fe sublattice network. Magnetic spectra of the high-pressure phase, stabilized in a rectangular Fe sublattice network at P>8 GPa, exhibit fingerprints of iron in an intermediate valence state only. Temperature-dependent resistivity pressure studies evidence thermally activated small polaron motion in the high-pressure phase. These experimental signatures, complemented by ab initio calculations of electronic structure, are considered evidence of asymmetric dimer formation Fe (2+ +) ⇔ Fe (3−)+ ,w h e r e the minority-spin electron deconfinement coefficient is = 0.3−0.4. Bragg satellites discerned in electron diffraction patterns of the metastable high-pressure phase possibly stem from this admixture of site-and bond-centered localization (intermediate-state charge order) in a magnetic background. This breaks inversion symmetry and potentially renders LuFe 2 O 4 in its high-pressure phase as a new charge order instigated (electronic) ferroelectric.

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“…Since frustrated charge ordering gives rise to only weak 6 Journal of Nanomaterials satellite reflections (i.e., diffuse scattering), so the technique of energy-filtered TEM is employed to significantly improve the visibilities of electron diffraction patterns and the dark-field images obtained using such weak reflections. Figure 7 shows the morphology of charge-ordered domains in LuFe 2 O 4 [26]. Figure 7(a) is the selected area electron diffraction pattern of LuFe 2 O 4 recorded at 299 K, which exhibits a feature of a characteristic diffuse scattering caused by charge ordering in LuFe 2 O 4 , as marked by the black arrows in Figure 7(a).…”

Section: Multiferroic Domains Inmentioning

confidence: 99%

Characterization of Multiferroic Domain Structures in Multiferroic Oxides

Liang

et al. 2015

Journal of Nanomaterials

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Multiferroic oxides have been received much attention due to that these materials exhibit multiple ferroic order parameters (e.g., electric polarization in ferroelectrics, magnetization in ferromagnetics, or spontaneous strain in ferroelastics) simultaneously in the same phase in a certain temperature range, which offer an exciting way of coupling between the ferroic order parameters. Thus, this provides a possibility for constructing new type of multifunctional devices. The multiferroic domain structures in these materials are considered to be an important factor to improve the efficiency and performance of future multiferroic devices. Therefore, the domain structures in multiferroic oxides are widely investigated. Recent developments in domain characterization techniques, particularly the aberration-corrected transmission electron microscopy (TEM), have enabled us to determine the domain structures at subangstrom scale, and the recent development ofin situTEM techniques allows ones to study the dynamic behaviors of multiferroic domains under applied fields or stress while the atomic structure is imaged directly. This paper provides a review of recent advances on the characterization of multiferroic domain structures in multiferroic oxides, which have been achieved by the notable advancement of aberration-corrected TEM.

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Observations of charge-ordered and magnetic domains in LuFe2O4using transmission electron microscopy

Cited by 13 publications

References 34 publications

Ferroelectricity from iron valence ordering in rare earth ferrites?

Ferroelectricity from iron valence ordering in rare earth ferrites?

Coexistence of site- and bond-centered electron localization in the high-pressure phase ofLuFe2O4

Characterization of Multiferroic Domain Structures in Multiferroic Oxides

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