Crystal structure of YbFe2O4 films prepared under different partial oxygen pressure

Nagata, T.; Hiraoka, Kyoya; Okamoto, Takuya; Iwata, N.

doi:10.1016/j.tsf.2018.09.012

Cited by 3 publications

(2 citation statements)

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“…Although there has been a decent amount of work on YbFe 2 O 4 , most of the published articles have been on the bulk samples and there is only a small number of studies on YbFe 2 O 4 thin films. [34,35,36,37] Additionally, the systematic studies on the optical properties and electronic excitations of YbFe 2 O 4 are very limited. Since both ferroelectric and magnetic properties of YbFe 2 O 4 come from the Fe d electrons, understanding of the electronic transitions and their temperature dependence is very important.…”

Section: Introductionmentioning

confidence: 99%

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: 99%

Optical and Electro-Optical Properties of YbFe2O4 Thin Films

et al. 2021

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“…22) Although YbFe 2 O 4 epitaxial films with high crystallinity can be obtained, the critical issue of iron deficiency has not been overcome because the process window to form the YbFe 2 O 4 epitaxial films is very narrow. Although several reports on the film growth of YbFe 2 O 4 have been published, 23,24) there have been no reports regarding the issue of the iron deficiency. To discuss the effect of the iron composition in YbFe 2 O 4 epitaxial thin films on the charge ordering transition, herein, a study to expand the process window for the formation of YbFe 2 O 4 epitaxial thin films is undertaken.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of chemical composition controlled YbFe₂O₄ epitaxial thin films

Tanaka

Miura

Kiriya

et al. 2019

Jpn. J. Appl. Phys.

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The crystal growth of YbFe2O4 requires oxidant-poor conditions, thus YbFe2O4 usually contains a large number of iron deficiencies even in the bulk single crystal. The use of an ArF laser for laser ablation is effective to reduce the amount of active oxygen species and a wide process window to form the YbFe2O4 epitaxial films becomes available. By using the widened process window and an iron-rich target, the chemical composition of the YbFe2O4 epitaxial thin films is successfully controlled. The effect of the iron composition on the charge ordering transition can be discussed using the nonlinear I–V behavior. The threshold electric field changes depending on the iron composition owing to the broadening of the 3-dimensional (3D) charge order region, which affects the robustness of the 3D charge order against an electric field in YbFe2O4 thin films.

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