Abstract
A microscopic model has been proposed which gives an explanation of the observed anomalies in the phonon spectra of hydrogen-bonded ferroelectrics. Using a Green's function technique we have obtained a nonlinear temperature dependence of the frequencies of the phonon modes in PbHPO 4 and H 2 C 2 O 4 in agreement with the experimental data. The importance of the proton ordering effects, i.e. the pseudo-spin-phonon interaction on the lattice modes is shown.
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