Incommensurate Charge Ordering in Charge-Frustrated LuFe2O4System

Yamada, Y.; Nohdo, S.; Ikeda, Naoshi

doi:10.1143/jpsj.66.3733

Cited by 90 publications

(85 citation statements)

References 9 publications

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“…[12] The same amount of Fe 2+ and Fe 3+ coexists in this system at equivalent sites in the triangular lattice, and the interaction between Fe 2+ and Fe 3+ is accompanied by a frustration of the triangular lattice, which manifests in a three-dimensional (3D) charge-ordered state below 330 K (the charge-ordering temperature T CO for LuFe 2 O 4 ). [13,14] Upon cooling, the magnetic moments are ordered ferrimagnetically along the caxis below 250 K (the Néel temperature T N ). [7] Although many attempts have been made to investigate the magnetic and electrical properties in this system, the multiferroic mechanism is not very clear.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of phonon spectra and structural characteristics in multiferroic LuFe₂O₄ system

Hou

Yao

Dong

et al. 2011

J Raman Spectroscopy

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The phonon spectra and structural characteristics of the LuFe 2 O 4 system were investigated using X-ray diffraction as well as Raman and infrared (IR) spectroscopic techniques. Two step-like anomalies of the wavenumbers of the E 3 g peak in the Raman spectra and the E 3 u peak in IR spectra, as well as some weak anomalies of the lattice parameters, were found around the ferrimagnetic and ferroelectric transition temperatures. The substitutions of Lu with Yb and Fe with Mn lead to the corresponding wavenumber shifts in the optical spectra, which can be attributed to the changes in the atomic mass and lattice parameters. Furthermore, the Raman intensity was found to be related to the changes in the local structure and electrical conductivity. These results illustrate that the structural fluctuations could effectively influence the phonon modes, and a possible interplay among the structural, magnetic, and charge-ordering properties exists in this multiferroic system. Copyright

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Section: Introductionmentioning

confidence: 99%

Temperature dependence of phonon spectra and structural characteristics in multiferroic LuFe₂O₄ system

Hou

Yao

Dong

et al. 2011

J Raman Spectroscopy

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“…The origin of ferroelectricity in this kind of material is fundamentally correlated with the CO transition arising from strong electron correlation [3][4][5] ; the giant room-temperature magnetodielecric response 6 , which are sandwiched by a thick R 2 O 3 layer 9 . The spin/charge behavior in the double Fe-layers directly affect the magnetic features and, in particular, the ferroelectricity 10,11 .…”

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confidence: 99%

Charge-Stripe Order in the Electronic FerroelectricLuFe2O4

Zhang

Yang

et al. 2007

Phys. Rev. Lett.

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The structural features of the charge ordering states in LuFe 2 O 4 are characterized by in-situ cooling TEM observations from 300K down to 20K. Two distinctive structural modulations, a major q 1 = (1/3, 1/3, 2) and a weak q 2 =q 1 /10 + (0, 0, 3/2), have been well determined at the temperature of ~20K. Systematic analysis demonstrates that the charges at low temperatures are well crystallized in a charge stripe phase, in which the charge density wave behaviors in a non-sinusoidal fashion resulting in elemental electric dipoles for ferroelectricity. It is also noted that the charge ordering and ferroelectric domains often change markedly with lowering temperatures and yields a rich variety of structural phenomena.

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“…Indeed, similar features have been observed in several systems where the charge order can be described in terms of charge density waves (CDW) and this is also the case of LFO. [9] For example, in the manganite La 0.25 Ca 0.75 MnO 3 , below the charge ordering temperature T CO a narrow peak at 7.5 cm −1 is observed, followed by a broad absorption at ∼ 30 cm −1 .…”

Section: Atoms Wyckoffmentioning

confidence: 99%

“…These contradictory findings can be reconciled by considering that the antiferroelectric ground state and the ferroelectric state may be so close in energy [8] that even a small electric field stabilizes the latter one. Concerning the magnetic behavior of LFO, a two-dimensional ferrimagnetic order is established below T N ≃ 240 K [9]. However, a surprising decrease in the magnetic correlation length is observed below T L = 175 K. [10] Finally, it has been found that the dielectric constant decreases sharply both under weak magnetic [11] and electric [12] fields, which also cause a drop in the resistivity by several orders of magnitude.…”

Section: Introductionmentioning

confidence: 98%

Infrared study of the charge-ordered multiferroicLuFe2O4

et al. 2010

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The reflectivity of a large LuFe2O4 single crystal has been measured with the radiation field either perpendicular or parallel to the c axis of its rhombohedral structure, from 10 to 500K, and from 7 to 16000 cm −1 . The transition between the two-dimensional and the three-dimensional charge order at TCO = 320 K is found to change dramatically the phonon spectrum in both polarizations. The number of the observed modes above and below TCO, according to a factor-group analysis, is in good agreement with a transition from the rhombohedral space group R3m to the monoclinic C2/m. In the sub-THz region a peak becomes evident at low temperature, whose origin is discussed in relation with previous experiments.

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Incommensurate Charge Ordering in Charge-Frustrated LuFe₂O₄System

Cited by 90 publications

References 9 publications

Temperature dependence of phonon spectra and structural characteristics in multiferroic LuFe₂O₄ system

Temperature dependence of phonon spectra and structural characteristics in multiferroic LuFe₂O₄ system

Charge-Stripe Order in the Electronic FerroelectricLuFe2O4

Infrared study of the charge-ordered multiferroicLuFe2O4

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Incommensurate Charge Ordering in Charge-Frustrated LuFe2O4System

Cited by 90 publications

References 9 publications

Temperature dependence of phonon spectra and structural characteristics in multiferroic LuFe2O4 system

Temperature dependence of phonon spectra and structural characteristics in multiferroic LuFe2O4 system

Charge-Stripe Order in the Electronic FerroelectricLuFe2O4

Infrared study of the charge-ordered multiferroicLuFe2O4

Contact Info

Product

Resources

About

Incommensurate Charge Ordering in Charge-Frustrated LuFe₂O₄System

Temperature dependence of phonon spectra and structural characteristics in multiferroic LuFe₂O₄ system

Temperature dependence of phonon spectra and structural characteristics in multiferroic LuFe₂O₄ system