MICROSCOPIC POLARIZABILITY MODEL OF FERROELECTRIC SOFT MODES

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Abstract
A simplified version of a recent microscopic model of ferroelectric soft modes1 is studied. It is shown that the compensation of long-range and short-range forces2 which induces the soft mode behaviour of ferroelectric systems can be expressed in terms of a simple linear chain model with a non-linear polarizability at the chalcogenide ion lattice site3. This polarizability is equivalent to an on-site electron-two-phonon coupling. The four different temperature regimes which result from the model equations are discussed. The model is applicable to completely different systems such as perovskites, SbSI4, IV-VI5 semiconductors and K2SeO46,7

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