DYNAMIC SUSCEPTIBILITY OF A MODEL QUANTUM GLASS

We study here the dynamic susceptibility of a model quantum glass. A s tatistical mechanical treatment, based on a mean-field analysis of the transverse Ising model, is able to account for the competition betwee n disorder and frustration, on the one hand, and quantal fluctuations on the other. Our results derived for the dynamic susceptibility are i n qualitative agreement with experimental measurements on a recently s tudied dipolar-coupled quantum glass, namely LiHoxY1-xF4, whose quantu m term can be manipulated in the laboratory.