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The static polarization of lead magnesium niobate has been studied using a standard Sawyer-Tower circuit. The square-to-slim-loop hysteresis transition was phenomenologically modeled by modifying N\'eel's equation for the magnetization of a superparamagnet to a similar relationship for a superparaelectric. A temperature-dependent internal dipole field was included to account for cluster interactions. The slim-loop polarization curves were found to scale to E/ (T-T₅), where E is the electric field and T₅ the freezing temperature. A glassy character was subsequently proposed to exist in the zero-field-cooled state with local dipole fields between superparaelectric moments controlling the kinetics of the polarization reversals and the freezing process. Recent quasielastic-neutron-scattering results have been interpreted to support this model.
Viehland et al. (Mon,) studied this question.
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