Abstract
We report UHF (0.9 GHz) complex dielectric measurements on (KBr) 1−x(KCN) x systems with x=0.001, 0.01, 0.10 and 0.50 in the temperature range from 80 mK to 100 K. Higher temperature peaks in the dielectric constant of both real and imaginary parts, characteristic of dipolar freezing, were observed for x⩾0.01. A log-log plot of x versus the freezing temperature suggests a power law dependence (∼x 2 3 ) of the freezing temperature on the dipole concentration. A strong resonant absorption enhancement at low temperatures, indicating an existence of two level systems, was observed for x=0.01 sample. The dielectric constant for x=0.001 sample follows a Curie-Weiss law.
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