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- W4384029213 abstract "A charge order-driven ferroelectricity, a novel mechanism completely different from conventional types such as lattice distortion observed in a typical ferroelectric, has been expected for a series of compounds $R{mathrm{Fe}}_{2}{mathrm{O}}_{4}$ ($R=mathrm{Ho}ensuremath{sim}mathrm{Lu}$ and Y, In), but a real problem has been still unsolved whether or not the compounds are truly ferroelectric. Here, we demonstrate that $mathrm{Tm}{mathrm{Fe}}_{2}{mathrm{O}}_{4}$, one of the $R{mathrm{Fe}}_{2}{mathrm{O}}_{4}$ family, is a true ferroelectric and piezoelectric compound with noncentrosymmetric structure (space group: $Cm$) at room temperature by using switching spectroscopy piezoelectric force microscopy, laser interferometry, scanning nonlinear dielectric microscopy, x-ray diffraction, selected-area electron diffraction, nano-beam electron diffraction, convergent-beam electron diffraction, and high-angle annular dark-field scanning transmission electron microscopy for single-crystalline $mathrm{Tm}{mathrm{Fe}}_{2}{mathrm{O}}_{4}$. We have also found that $mathrm{Tm}{mathrm{Fe}}_{2}{mathrm{O}}_{4}$ exhibits an electric field induced phase transition between ferroelectric and conductive states. We propose that the charge ordering of ${mathrm{Fe}}^{2+}$ and ${mathrm{Fe}}^{3+}$ ions accompanied by an ordered displacement of ${mathrm{Tm}}^{3+}$ ions lead to the ferroelectricity and piezoelectricity." @default.
- W4384029213 created "2023-07-13" @default.
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- W4384029213 date "2023-07-12" @default.
- W4384029213 modified "2023-10-16" @default.
- W4384029213 title "Confirmation of ferroelectricity, piezoelectricity, and crystal structure of the electronic dielectric <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>Tm</mml:mi><mml:msub><mml:mi>Fe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W4384029213 doi "https://doi.org/10.1103/physrevb.108.014105" @default.
- W4384029213 hasPublicationYear "2023" @default.
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