Abstract
The influence of the soft phonon branch on some characteristics of the impurity vibronic absorption spectra in ferroelectrics is qualitatively analyzed and illustrated using simple models. The following quantities are discussed: the intensity, the temperature shift and the half width of the no-phonon line, the one-phonon wing, the integral intensity of a parity forbidden band. It is shown that near the phase transition point ( T > T c) all these characteristics must show anomalous dependencies on temperature, if compare with usual matrix crystals. The observation of “plateaus” may be expected in these dependencies. Various aspects of obtaining information from measured impurity vibronic spectra of ferroelectrics are discussed.
Published Version
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