INTRINSIC-FIELD COOPERATIVE FREEZING INTO ORIENTATIONAL GLASS-PHASE IN SOLID HYDROGEN - THEORY AND EXPERIMENT

We report on the mechanism of orientational freezing in ortho-parahydr ogen mixtures. We argue that instead of the Zeeman-type uncorrelated i ntrinsic field, which dominats at high temperatures, the molecular ord ering field, strongly correlated by the reaction Onsager-type field, d rives the cooperative short-range ordering into the glass-like states. This mechanism is in accord with the observed unsaturated orientation al order caused by moderation of the ordering field.