Abstract
The dielectric response of canonical relaxor PMN single crystal oriented in [111] direction was investigated under the influence of various dc bias electric fields. The behavior of the Vogel-Fulcher temperature obtained from the characteristic relaxation times determined from the peaks of the imaginary component ϵ″(T) of the complex dielectric constant ϵ*(T) was studied as a function of the dc bias electric field. The observed results reveal nonmonotonous behavior of the Vogel-Fulcher temperature as a function of the strength of the dc bias electric field. We show that such a behavior can be well interpreted in terms of nonlinear dielectric susceptibility as a dominant factor in the dielectric dynamic of relaxors in dc bias electric fields.
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