Paraelectric in a Strong High-Frequency Field
Abstract
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 (ω0 << ωsm), rather than for the external field frequency ω0 close to the soft mode frequency ωsm. 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.
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