Abstract
Temporal relaxation of the field-induced remanent polarization has been investigated on the deuteron glass ${\mathrm{Rb}}_{0.7}({\mathrm{ND}}_{4}{)}_{0.3}{\mathrm{D}}_{2}{\mathrm{AsO}}_{4}$ in the temperature range $10lTl30\mathrm{K}.$. The data are approximately described by Curie--von Schweidler and Kohlrausch-Williams-Watts decay laws at high $(Tg25\mathrm{K})$ and low temperatures $(Tl20\mathrm{K}),$ respectively. A nearly perfect description is, however, provided by the dynamically correlated domain model, which is based upon Chamberlin's concept of dynamical heterogeneity. On decreasing the temperature, the thermally activated dynamic behavior crosses over into nonactivated dynamics.
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