Charge and spin ordering process in the mixed-valence system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LuFe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml:math>Charge ordering

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

doi:10.1103/physrevb.62.12167

Cited by 141 publications

(163 citation statements)

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“…Fig. 4a1 represents a typical [1][2][3][4][5][6][7][8][9][10] zone-axis diffraction pattern of LuFe 2 O 4 ，showing the presence of superstructure reflections from two modulations (q1 and q2) as discussed in our previous publications [6,10]. These structural modulations can be well interpreted by the Fe 3+ , Fe 2.5+ and Fe 2+ ionic ordering which plays an important role for the multiferroic discovered in present materials.…”

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confidence: 79%

“…The charge-frustrated RFe 2 O 4 system (R=Y, Er, Yb, Tm and Lu) has been extensively studied due to its rich variety of interesting physical properties and immense potential for technical applications, such as the spin/charge ordering [1], the multiferroic and the large magnetodielectric effects [2]. It is noted that the frustrated spin/charge system shows not only complex magnetic phase but also drive some new classes of physical phenomena [3,4].…”

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confidence: 99%

“…In order to obtain the LuFe 2 O 4 single crystals, the LuFe 2 O 4 powder was heated to 1620 in a platinum crucible, ℃ and then the melted solid was cooled to 900 °C at a rate of 1°C/min. The whole process is carried out under a CO 2 The fundamental I-V characteristics of LuFe 2 O 4 were firstly measured on a number of polycrystalline materials that show up remarkable multiferroic in the charge ordered state as discussed in previous publications [1,5,6]. The current density (J) and electric field (E) in measurements were also computed numerically for each sample.…”

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Nonlinear current-voltage behavior and electrically driven phase transition in charge-frustrated LuFe ₂ O ₄

et al. 2008

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Electric transport measurements of the charge frustrated LuFe 2 O 4 , in which the charge ordering (CO) and electronic ferroelectricity are found, reveal strong nonlinear electric conduction upon application of electrical field in both single crystalline and polycrystalline samples. The threshold electric fields (E t ) in single crystalline LuFe 2 O 4 are estimated respectively to be about 60V/cm and 10V/cm with E parallel and perpendicular to the c-axis direction. Experimental measurements also demonstrate that the I-V nonlinearity increases quickly with lowering temperature. Furthermore, our in-situ TEM investigations evidently reveal that the nonlinear I-V behavior is intrinsically in correlation with a current driven charge ordering insulator-metal transition, and the applied electrical field triggers a visible CO collapse recognizable as the fading of satellite spots of the CO modulations. PACS number(s): 75.47. Lx, 74.25.Jb

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Nonlinear current-voltage behavior and electrically driven phase transition in charge-frustrated LuFe ₂ O ₄

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“…9 LuFe 2 O 4 undergoes successive phase transitions. 2D charge correlations are observed below 500 K, while the ferroelectric phase transition is proposed to coincide with a 3D Fe 3+ /Fe 2+ CO below 320 K. 4,5,10 This is followed by ferrimagnetic order below T N ∼ 240 K. 2,[11][12][13] The general claim about ferroelectricity in LuFe 2 O 4 has been based on the following experimental results: (i) the observation of giant dielectric constant at temperatures above 150 K, [4][5][6] and (ii) the measurement of the pyroelectric current after field polarization. 4,5,14 The colossal dielectric properties reported for LuFe 2 O 4 (Refs.…”

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confidence: 99%

Intrinsic electrical properties of LuFe2O4

et al. 2013

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We here revisit the electrical properties of LuFe 2 O 4 , compound candidate for exhibiting multiferroicity. Measurements of dc electrical resistivity as a function of temperature, electric-field polarization measurements at low temperatures with and without magnetic field, and complex impedance as a function of both frequency and temperature were carried out in a LuFe 2 O 4 single crystal, perpendicular and parallel to the hexagonal c axis, and in several ceramic polycrystalline samples. Resistivity measurements reveal that this material is a highly anisotropic semiconductor, being about two orders of magnitude more resistive along the c axis. The temperature dependence of the resistivity indicates a change in the conduction mechanism at T CO ≈ 320 K from thermal activation above T CO to variable range hopping below T CO . The resistivity values at room temperature are relatively small and are below 5000 cm for all samples but we carried out polarization measurements at sufficiently low temperatures, showing that electric-field polarization curves are a straight line as expected for a paraelectric or antiferroelectric material. Furthermore, no differences are found in the polarization curves when a magnetic field is applied either parallel or perpendicular to the electric field. The analysis of the complex impedance data corroborates that the claimed colossal dielectric constant is a spurious effect mainly derived from the capacitance of the electrical contacts. Therefore, our data unequivocally evidence that LuFe 2 O 4 is not ferroelectric.

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“…That is, below the ferroelectric transition temperature, such a displacement leads to the formation of electric dipole arising from the breaking of inversion symmetry. On the other hand neutron and electron diffraction experiment reporting the √3 x √3 structure within the a-b plane, is considered to detect the ionic displacement component of the superstructure for RFe 2 O 4 [4][5][6]. Below 330 K, the displacement manifests itself as the √3 x √3 structure within the a-b plane, which is the same as that for the charge-ordered structure.…”

Section: Introductionmentioning

confidence: 89%

Local Structure Modulation in the Electronic Ferroelectric Oxide LuFe<sub>2</sub>O<sub>4</sub>

Hayakawa

Morimoto

Ikeda

et al. 2009

Trans. Mat. Res. Soc. Japan

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We have investigated the physical properties and local atomic structure of LuFe 2 O 4 , a material belonging to the multiferroic system RFe 2 O 4 (R: rare earths) which shows the new type of ferroelectricity owing to the charge ordering of Fe ions. Magnetic measurements showed the ferromagnetic ordering of Fe spins at ~230 K, as reported previously. From dielectric measurements, the dielectric constant (ε') of ~10000 was obtained at around room temperature. In addition, a peak of ε' was observed near the charge-ordering temperature (~330 K). The peak temperature was insensitive to the frequency of AC electric field; this behavior is different from that found in a previous study. The pair-distribution function analysis on a high-energy X-ray diffraction pattern revealed that LuFe 2 O 4 has the systematic modulation of the local atomic displacement.

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Charge and spin ordering process in the mixed-valence systemLuFe2O4:Charge ordering

Cited by 141 publications

References 10 publications

Nonlinear current-voltage behavior and electrically driven phase transition in charge-frustrated LuFe ₂ O ₄

Nonlinear current-voltage behavior and electrically driven phase transition in charge-frustrated LuFe ₂ O ₄

Intrinsic electrical properties of LuFe2O4

Local Structure Modulation in the Electronic Ferroelectric Oxide LuFe<sub>2</sub>O<sub>4</sub>

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Charge and spin ordering process in the mixed-valence systemLuFe2O4:Charge ordering

Cited by 141 publications

References 10 publications

Nonlinear current-voltage behavior and electrically driven phase transition in charge-frustrated LuFe 2 O 4

Nonlinear current-voltage behavior and electrically driven phase transition in charge-frustrated LuFe 2 O 4

Intrinsic electrical properties of LuFe2O4

Local Structure Modulation in the Electronic Ferroelectric Oxide LuFe<sub>2</sub>O<sub>4</sub>

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Product

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Nonlinear current-voltage behavior and electrically driven phase transition in charge-frustrated LuFe ₂ O ₄

Nonlinear current-voltage behavior and electrically driven phase transition in charge-frustrated LuFe ₂ O ₄