A change in the effective permittivity of a ferroelectric film in the paraelectric phase under the action of a strong high-frequency field (nonequilibrium soft mode heating) is considered. It is shown that this effect must be most clearly pronounced far from the resonance (\omega_0 << \omega_sm), rather than for the external field frequency \omega_0 close to the soft mode frequency \omega_sm. The effective permittivity as a function of the high-frequency field amplitude is calculated using the phenomenological approach and within the microscopic theory based on the simple model of a displacement-type ferroelectric.
@article{arxiv.0901.2421,
title = {Paraelectric in a Strong High-Frequency Field},
author = {A. I. Sokolov},
journal= {arXiv preprint arXiv:0901.2421},
year = {2009}
}