Abstract
Abstract Stability of the soft mode and spectral characteristics of the correlation functions for H-bonded ferroelectrics are discussed, within the transverse Ising model, in terms of an interaction made of both nearest-neighbour and dipole-dipole contributions. The numerical results, obtained at infinite temperature and in the critical region (T → T + c ) show how shift and width of the soft mode vary with the interdipolar interaction weight. The shape asymmetry of χ″zz(ω) exhibited by KDP in its paraelectric phase is also shown to be due to the dipolar character of the interaction.
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