Abstract
Abstract The static and dynamic aspects of the Electric Field Gradient (EFG) in ionic perovskite (anti-) ferroelectric crystals have been studied with particular emphasis on the Perturbed Angular Correlation method. We analyze the effect of the lattice fluctuations on the temperature behavior of the EFG. The proper averaging procedure of the perturbation function is outlined. This results in a simple relationship between the electric (sub-) lattice susceptibility and the measured EFG, predicting a critical behavior of EFG on approaching T c . In addition to this dynamical effect we show that well below T c , the temperature dependence of EFG is dominated by P s 2 , the square of the spontaneous polarization of the (sub-) lattice. These predictions are shown to be in qualitative agreement with published experimental data.
Published Version
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