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(Color online) (a) Schematic diagram of the X(Z,Y)-X scattering geometry for the Raman measurements, and (b) Raman spectra of BCTO-0.233 as a function of temperature. The spectral component due to the leakage of acoustic phonon is indicated by an open star.
(Color online) Fitting examples for low frequency (<100 cm−1) spectra obtained at various temperatures.
(Color online) Temperature dependences of the harmonic frequency ω 0 (open squares), the damping constant γ (circles), and the soft mode frequency ω s (open triangles). The shaded area indicates the temperature region of over-damped soft modes (ω 0 > γ).
(Color online) Temperature dependences of (a) the dielectric permittivity and (b) the inverse of squared harmonic frequency.
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