Central Peak in Raman Spectra of Ferroelectric KDP and DKDP Crystals

The ferroelectric phase transition in K(H1 − x D x )2PO4 crystals was investigated by Raman scattering. It was found that the temperature dependence of the central peak in typical order—disorder crystals K(H 1 − x D x )2PO4 consists of three temperature ranges: in the nearest vicinity of the phase transition temperature the width and the amplitude of the central peak follow the theoretical predictions; in the second temperature range the “critical slowing down” is manifested whereas the behavior of the amplitude is strongly nonlinear; and outside these temperature ranges the central peak does not follow the theoretical predictions.

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