a Study of the Quadrupolar Glass Phase of Deuterium via Proton NMR.
The NMR properties of an isolated o-H(,2) impurity in solid D(,2) have been measured as a function of p-D(,2) concentration and temperature. Cusplike behavior in the spin-lattice relaxation time, T(,1), is observed and is used to locate the transition to the quadrupolar glass phase. The transition temperatures determined here are considerably higher than measured in the past and show a cutoff for concentrations less than .28. Lineshape measurements show that ordering starts at relatively high temperatures and progresses smoothly as the temperature is lowered. A cooperative freezing of the rotational system occurs at T(,c) causing a collapse in the correlation frequency spectrum.
- Pub Date:
- Physics: Condensed Matter