Research Papers in Physics and Astronomy


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Published in Physical Review B Volume 40, Number 17, 15 December 1989-I. Copyright © 1989 The American Physical Society. Used by permission.


The characteristic features of the dielectric response spectrum associated with the condensation of a "soft" phonon mode during a ferroelectric phase transition can be reproduced by an oscillator moving in a damped linear double-well potential. The behavior of the response function below the transition temperature Tc can be simulated by introducing a linear mean-field coupling which destroys the symmetry of the well. Potentials derived from physically realistic parameters are shown to result in dielectric responses which are in order-of-magnitude agreement with experimental values.

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