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- W2022887972 abstract "A comparative study of first-order Raman scattering in ${mathrm{K}}_{0.984}$${mathrm{Li}}_{0.016}$Ta${mathrm{O}}_{3}$ and K${mathrm{Ta}}_{0.976}$${mathrm{Nb}}_{0.024}$${mathrm{O}}_{3}$ single crystals has been performed. The soft-phonon line shows marked differences in the two systems, revealing a distinctive behavior with regard to the scale of polar order. Analysis of the low-frequency spectrum allows for an estimate of the polar correlation length in the Li-doped sample; this is limited to the nanometric scale, in agreement with the view of a dipole-glass transition. No evidence of a similar situation is found in the Nb-doped sample, where the general trend of soft-mode frequencies and intensities suggests a transition to a state of long-range order, for the quoted concentration. The intensities of the hard-phonon spectra and the T${mathrm{O}}_{4}$ linewidth are shown to confirm the different evolution of the polar transition in the two systems." @default.
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- W2022887972 title "Raman scattering and the evolution of polar order in Li-doped and Nb-doped KTa<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W2022887972 doi "https://doi.org/10.1103/physrevb.53.5240" @default.
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