Stability of cluster glass state in nano order sized YbFe 2 O 4 powders

Kobayashi, Hiroyuki; Fujiwara, Kosuke; Kobayashi, Naoya; Ogawa, Takeshi; Sakai, Masahiro; Tsujimoto, Manabu; Seri, Osami; Mori, Shigeo; Ikeda, Naoshi

doi:10.1016/j.jpcs.2016.12.014

Cited by 8 publications

(9 citation statements)

References 26 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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“…14,27 It is reported that the non-stoichiometric samples show a ferrimagnetic and spin-glass transitions at higher temperatures in comparison to the stoichiometric samples. 28 This suggests that our sample quality is good. In fact, our magnetization data are very similar and consistent with the data reported by other researchers.…”

Section: Resultsmentioning

confidence: 94%

“…In fact, our magnetization data are very similar and consistent with the data reported by other researchers. 11,[28][29][30] While LFO goes through a magnetostructural transition at T LT ∼ 175 K, 8,17 YbFO does not show such transition. The broad peak at 190 K, however, indicates a change in the spin structures as a result of interaction between spins on different Fe sub-lattices and spin fluctuations.…”

Section: Resultsmentioning

confidence: 96%

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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“…Many NPs comprised of heavy elements with high atomic number (high-Z) are proposed as a new class of CT contrast media to address shortcomings attributed to clinical iodinated agents. Over the range of 100-140 kVp, which are feasible settings for CT, barium, gadolinium, ytterbium, and tantalum produce higher CT image contrast than that achieved by currently available iodinated contrast agents at equal mass concentration [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…Ytterbium ferrite hybrid NPs can be appropriate candidates for multiplatform CA for medical imaging [25]. These hybrid NPs can be synthetized by different bottom up methods such as co-precipitation, thermal decomposition, microwave or solvothermal synthesis [27,28].…”

Section: Introductionmentioning

confidence: 99%