Growth of YbFe2O4 single crystals exhibiting long-range charge order via the optical floating zone method

Williamson, H.L.; Mueller, Thomas J.; Angst, Manuel

doi:10.1016/j.jcrysgro.2017.05.034

Cited by 9 publications

(14 citation statements)

References 39 publications

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“…[9,11,13,14] The ferrimagnetic transition due to the ordering of the Fe 2+ and Fe 3+ moments occurs around 240 K in this family. Similarly, the Fe 2+ -Fe 3+ charge-ordered state has been reported in LuFe 2 O 4 [15,16,17] and in YbFe 2 O 4 [18,19,20]. Such charge ordering is believed to break the space-inversion symmetry, leading to macroscopic ferroelectric polarization.…”

Section: Introductionmentioning

confidence: 65%

Optical and Electro-Optical Properties of YbFe2O4 Thin Films

et al. 2021

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We present the optical and electro-optical properties of YbFe2O4 thin films, deposited on (0001) sapphire substrates. The optical spectra of YbFe2O4 show several electronic peaks arising from Fe2+ d to d on-site and O 2p to Fe 3d, Yb 6s, and Yb 5d charge-transfer transitions. The temperature dependence of the d to d electronic transition displays an anomaly around 150 K, which could be associated with a structural instability. Moreover, the YbFe2O4 thin film show strong electric-field-induced changes in optical properties in the energy range of 1-3 eV for applied electric fields less than 1 kV/cm. These electro-optical effects, which vary almost linearly with applied electric fields, are up to 14 % in magnitude at low temperatures and the effects completely disappear above 120 K. The observed electro-optical effects could be associated with the effects of external electric fields on the orbital-charge ordering of Fe ions.

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Section: Introductionmentioning

confidence: 65%

Optical and Electro-Optical Properties of YbFe2O4 Thin Films

et al. 2021

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“…At low temperature, the spins of Yb 3+ ions could play a significant role in the magnetic state of the system. In particular, the interactions of the Yb 3+ (4f 13 ) spins with the Fe spins could lead to a complicated spin structure at low temperatures. We interpret that the reversal of the moment below 65 K is due to the emergence of the spins of Yb 3+ ions.…”

Section: Resultsmentioning

confidence: 99%

“…It is possible that the observed temperature dependence of the M-H hysteresis loops below 65 K could be attributed to a spin-glass state due to the competition between ferromagnetic and antiferromagnetic interactions of Yb and Fe sub-lattices. There have been reports of a spin-glass state in YbFO below 80 K. 10,12,13 The one caveat is that the highest magnetic field was 8 T, which was not sufficient to drive the full saturation of magnetization in the sample and thus, the coercive field (H * c ) value at each temperature (Fig. 2(d)) does not represent its true value and its temperature dependence only represents a qualitative feature.…”

Section: Resultsmentioning

confidence: 99%

“…[4][5][6][7][8] As a result, this family of oxides exhibit a series of magnetic transitions and the chargeordering phenomenon. In particular, YbFO goes through a spin-glass transition below ∼80 K, a ferrimagnetic transition at ∼245 K, and a three-dimensional charge ordering (CO) transition at ∼300 K. [9][10][11][12][13][14] The family of RFe 2 O 4 attracted attention after Ikeda et al first reported that LFO is a high temperature (T N ∼240 K) multiferroic in which the electrical polarization was interpreted as the CO induced phenomenon. 4,6,15 However, the subsequent studies by other researchers found that the colossal dielectric property and ferroelectricity of LFO were strongly influenced by the extrinsic effects, not drived by the anticipated CO mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and electrical transport properties of YbFe2O4

et al. 2019

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We present magnetic and electrical transport properties such as resistivity, magnetoresistance, dielectric, and polarization of polycrystalline YbFe2O4. The ferrimagnetic transition temperature is measured at 243 K, followed by the two low-temperature transitions at ∼190 K and ∼65 K, respectively. The magnetic properties including the M-H hysteresis loops exhibit a strong temperature dependence and possibly indicate a spin-glass state below 65 K for YbFe2O4. The iron Mössbauer measurement at 295 K confirms the presence of two Fe sites. The measured resistivity can be modeled with the Mott's variable-range hopping model, ρ ∝ exp(T0/T ) 1/4 , indicating the electron hopping between Fe 2+ and Fe 3+ sites. The magnetoresistance effects up to 6% at 8 T were observed and the effects could be caused by the field-induced changes in the electron hopping processes. The frequency-dependent complex dielectric constant has been found to be strongly influenced by the contact effects, and the polarization of polycrystalline YbFe2O4 does not show ferroelectricity.

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“…In particular, LuFe 2 O 4 was considered a clear example of ferroelectricity from charge ordering (CO) of Fe 2+ and Fe 3+ in the Fe-O bilayers [1], though recently this was contradicted [2,3,4,5]. Rare earth substitutions tune the relevant interactions within the Fe-O bilayers [6] resulting in a similar CO for R = Yb, which has almost the same ion size as Lu [7,8] but a dramatically different CO for the larger Y [9,10]. Another way to tune the CO is to focus on the interactions between different bilayers.…”

Section: Introductionmentioning

confidence: 99%

Growth of layered Lu$_2$Fe$_3$O$_7$ and Lu$_3$Fe$_4$O$_{10} $ single crystals exhibiting long-range charge order via the optical floating-zone method

Hammouda,

Angst

2019

Preprint

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We report the controlled growth of single crystals of intercalated layered Lu 1+n Fe 2+n O 4+3n−δ (n=1,2) with different oxygen stoichiometries δ. For the first time crystals sufficiently stoichiometric to exhibit superstructure reflections in X-ray diffraction attributable to charge ordering were obtained. The estimated correlation lengths tend to be smaller than for not intercalated LuFe 2 O 4 . For Lu 2 Fe 3 O 7 , two different superstructures were observed, one an incommensurate zigzag pattern similar to previous observations by electron diffraction, the other an apparently commensurate pattern with ( 1 3 1 3 0) propagation. Implications for the possible charge order in the bilayers are discussed. Magnetization measurements suggest reduced magnetic correlations and the absence of an antiferromagnetic phase.

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Growth of YbFe2O4 single crystals exhibiting long-range charge order via the optical floating zone method

Cited by 9 publications

References 39 publications

Optical and Electro-Optical Properties of YbFe2O4 Thin Films

Optical and Electro-Optical Properties of YbFe2O4 Thin Films

Magnetic and electrical transport properties of YbFe2O4

Growth of layered Lu$_2$Fe$_3$O$_7$ and Lu$_3$Fe$_4$O$_{10} $ single crystals exhibiting long-range charge order via the optical floating-zone method

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