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- W2002153364 abstract "Brillouin spectra of ferroelectric ${mathrm{PbHPO}}_{4}$ (${mathit{T}}_{mathit{c}}$=310 K) and its deuterated isomorph ${mathrm{PbDPO}}_{4}$ (${mathit{T}}_{mathit{c}}$=462 K) have been measured as a function of temperature across their transition temperatures. Certain longitudinal acoustic waves are found to exhibit anomalous propagation in the vicinity of ${mathit{T}}_{mathit{c}}$. The relaxation times, ${mathrm{ensuremath{tau}}}_{0}$, for a noninteracting dipole are evaluated from the Brillouin shifts, based on a phenomenological approach. The ${mathrm{ensuremath{tau}}}_{0}$ values are the same in both ${mathrm{PbHPO}}_{4}$ and ${mathrm{PbDPO}}_{4}$, indicating that the ferroelectric transition is driven by an order-disorder relaxation mode. This study also reveals that the paraelectric phase symmetry is, on a macroscopic scale, centrosymmetric." @default.
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- W2002153364 title "Brillouin spectroscopic evidence for a relaxation mode in ferroelectric<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>PbHPO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>PbDPO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:…" @default.
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- W2002153364 doi "https://doi.org/10.1103/physrevb.51.8005" @default.
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