Abstract
Abstract Structural instabilities and especially those which are related to polar instabilities and ferroelectric phase transitions are investigated within a modified φ4-model. Instead of describing these types of phase transitions within a rigid ion model with anharmonic ion-ion interactions the electronic degrees of freedom are seriously taken into account and shown to renormalize the temperature dependence of the soft mode frequency. Using a self-consistent phonon approximation quantitative agreement of theoretical calculations with experimental data is achieved for the temperature dependences of soft modes and related quantities.
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