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- W1974529601 abstract "Femtosecond time-domain observations of soft-mode dynamics in crystals near structural phase transitions have been conducted. Impulsive stimulated Raman scattering (ISRS) experiments are reported for both the orthorhombic phase of ${mathrm{KNbO}}_{3}$ and the tetragonal phase of ${mathrm{BaTiO}}_{3}$. The data from potassium niobate clearly show a heavily damped soft mode of ${mathit{B}}_{2}$ symmetry and relaxational modes of ${mathit{A}}_{1}$ symmetry but not ${mathit{B}}_{2}$ symmetry. Similarly, the data from barium titanate clearly show a heavily damped E-symmetry soft mode and no relaxational modes of this symmetry. The absence of relaxational modes of the same symmetries as the soft modes is consistent with an eight-site order-disorder model of the phase transitions in this crystal class. The present results demonstrate significant advantages of ISRS over conventional Raman spectroscopy of low-frequency, heavily damped soft modes." @default.
- W1974529601 created "2016-06-24" @default.
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- W1974529601 date "1994-10-01" @default.
- W1974529601 modified "2023-10-16" @default.
- W1974529601 title "Femtosecond time-resolved spectroscopy of soft modes in structural phase transitions of perovskites" @default.
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- W1974529601 doi "https://doi.org/10.1103/physrevb.50.8996" @default.
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