We report the high-resolution and broadband light-scattering spectroscopy of a single crystal of a prototypical relaxor ferroelectric, Pb(Mg1/3Nb2/3)O₃. A self-similar broad central peak, whose intensity is expressed as I(ω)∝ω^α has been observed, indicating the presence of a fractal in the crystal. A strong correspondence exists between the temperature dependence of the exponent α and that of the reported behaviors of polar nanoregions. The estimated fractal dimension (df≈2.6) at low temperatures clearly indicates a percolation transition of the polar nanoregions at around 240 K.
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Koreeda et al. (2012) studied this question.
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