Abstract
Quasielastic light scattering by phonon-density fluctuations in dielectric crystals has been investigated both experimentally and theoretically. In particular, the collisionless phonon regime, which has not been explored previously, has been studied in detail. The analysis using extended thermodynamics for the quasielastically scattered spectra in some dielectric crystals has been found to be consistent with the observed anomalous wave-vector dependence of the quasielastic scattering by phonon-density fluctuations at low temperatures. In addition, it can reproduce a broad doublet spectrum, which resembles those previously observed in quantum paraelectrics SrTiO 3 and KTaO 3 when the normal (momentum-conserving) phonon collision is dominant.
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