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- W2017143764 abstract "We report an extensive series of optical investigations of BaMn${mathrm{F}}_{4}$ near its incommensurate structural phase transition at ${T}_{i}ensuremath{approx}254$ K. We observe an inelastic central peak in the range (247ifmmodepmelsetextpmfi{}7) K. An anomaly occurs in the elastic scattered intensity at 241 K on heating, but the Raman peaks characteristic of the low-temperature phase persist up to 254 K. Measurements of the thermal diffusivity by a novel optical-electronic technique indicate that (1) the observed inelastic central peak is not due to entropy fluctuations, (2) the anomaly in the elastic central-peak intensity coincides with the peak in the pyroelectric coefficient, and (3) the value of pyroelectric coefficient changes sign within 1 K of ${T}_{i}$. The maximum in the inelastic central-peak intensity at 247 K may indicate another phase transition or may relate to the scattering mechanism. The anomaly in the elastic central peak is not a precise indicator of ${T}_{i}$, exhibits hysteresis, and may arise from static domain or defect scattering. The observed $stackrel{ensuremath{rightarrow}}{mathrm{q}}$ dependence of the inelastic central-peak width is consistent with an interpretation based on phason scattering and provides evidence for a strongly anisotropic, overdamped phason response in the incommensurate phase. Finally, we present evidence from detailed line-shape analysis that the observed intensity may actually be the result of coupling between the phason and the LA phonon." @default.
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- W2017143764 title "Incommensurate structural phase transition in BaMn<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>F</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Light scattering from phasons" @default.
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- W2017143764 doi "https://doi.org/10.1103/physrevb.25.1791" @default.
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