Abstract
We present a theory of Raman scattering by the low-lying soft coupled plasmon-longitudinal optical (LO) phonon modes at low temperatures in semiconducting incipient ferroelectrics. The softening of this mode gives a dynamical intimation of the screened LO phonon instability induced by the displacive ferroelectric phase transition. We compare our calculations with Raman spectra from n -KTaO 3 observed by Uwe et al. , on the basis of the soft mode-like behavior of the coupled modes as well as of the simple energy band structure.
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