DYNAMIC BEHAVIOR OF DEUTERON GLASS RB-0.7(ND4)(0.3)D2ASO4

Temporal relaxation of the field-induced remanent polarization has bee n investigated on the deuteron glass Rb-0.7(ND4)(0.3)D(2)ASO(4) in the temperature range 10 < T < 30 K. The data are approximately described by Curie-von Schweidler and Kohlrausch-Williams-Watts decay laws at h igh (T>25 K) and low temperatures (T < 20 K), respectively. A nearly p erfect description is, however, provided by the dynamically correlated domain model, which is based upon Chamberlin's concept of dynamical h eterogeneity. On decreasing the temperature, the thermally activated d ynamic behavior crosses over into;nonactivated dynamics.