Anomalous isotope effect on Raman linewidths in KH2AsO4 and KD2AsO4 crystals

I. Laulicht, R. Ofek

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Abstract

Experiment on Raman scattering in KH2AsO4 and KD2AsO4 single crystals in the temperature range of 50–300 K has shown an anomalous isotope effect on the linewidths of a few A1 modes in the 200–900 cm−1 region. The widths in the deuterated crystal are narrowed by a factor of two to four depending on the line and temperature. The behaviour of the proton relaxation time has been obtained as a function of temperature and found to be very similar to those obtained by Lowendes et. al. from the spectral feature of the soft mode. A drastic decrease in the linewidths by a factor of three occurs at the ferroelectric phase transition.

Original languageEnglish
Pages (from-to)41-51
Number of pages11
JournalJournal of Raman Spectroscopy
Volume4
Issue number1
DOIs
StatePublished - Oct 1975

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