Quasielastic light scattering from rutile

A. Koreeda, M. Yoshizawa, S. Saikan

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13 Citations (Scopus)


Quasielastic light scattering consisting of two components has been observed in single crystals of rutile (Formula presented) The broad component with a linewidth of 330 GHz at 297 K becomes narrower with decreasing temperature. In contrast, the narrow component, which has a linewidth of 1.1 GHz at 297 K, broadens as the temperature decreases. We present a unified explanation for both components, which is based on two-phonon difference Raman scattering. For the narrow component, it will be shown that two-phonon difference processes from a single acoustic phonon branch explain the temperature dependence of the intensity and the wave vector dependence of the linewidth at low temperatures. The conventional explanation in terms of entropy-fluctuation scattering is also attempted for temperatures above 200 K where phonon collisions occur more frequently than at lower temperatures and the phonon system may be considered hydrodynamically. For the broad component, two-phonon difference scattering from different phonon branches will be shown to provide a good explanation for the temperature dependent intensity. Furthermore, temperature dependence of the linewidth and its insensitivity to changes in scattering wave vector are also explained with this model.

Original languageEnglish
Pages (from-to)12730-12736
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number18
Publication statusPublished - 1999


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