Central Peak in a Slightly Deuterated KH₃(SeO₃)₂ Crystal Studied by Light Scattering

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In the Brillouin scattering spectra of a slightly deuterated KH₃(SeO₃)₂ crystal has been observed a central peak, of which intensity diverges near the transition temperature −58.6°C. The central peak is independent of the history of the specimen and shows VH polarization. This experimental result shows that the minor deuterium substituted for hydrogen is one of the origin of the central peak in the hydrogen-bonded ferroelastic KH₃(SeO₃)₂.