Dielectric Response Spectrum of a Damped One-Dimensional Double-Well Oscillator

Authors

J. W. Flocken, University of Nebraska at Omaha, Omaha, Nebraska
R. A. Guenther, University of Nebraska at Omaha, Omaha, Nebraska
John R. Hardy, University of Nebraska - LincolnFollow
L. L. Boyer, Naval Research Laboratory, Washington, D.C.

Date of this Version

12-15-1989

Comments

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

Abstract

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 T_c 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.