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O-D... O deuteron intra- and interbond exchange and frequency-dependent order parameter in deuteron glasses studied bt two-dimensional exchange NMR
Dolinšek, Janez, 1957- ; Zalar, Boštjan, 1964- ; Blinc, Robert
The question of whether the deuteron glass transition is an equlibrium phase transition or a metastable kinetic phenomenom, observed becauser of the finite experimental observation time, is ...addressed. Two-dimensional (2D) exchange NMR of O-D...O deuterons in deuteron glasses provides a unique possibility of a direct determination of the O-D...O intra- and interbond exchange time as well as for a determination of the Edwadrs-Anderson order parameter deeply in the glassy phase where 1D NMR methods for order parameter determination fail. On the frequency observation scales of spin-lattice relaxation and line-shape studies 10^3-10^8 Hz, the deuteron glass phase appears static. 2D exchange NMR extends the frequency observation window into the mHz regiom=n. The O-D...O deuteron intrabond exchange time [tau]_exch in Rb_0.68(ND_4)_0.32D_2AsO_4 has been determined as a function of temperature below 45 K. A Very slow fluctuation in the H-bond double minimum potential is detected which averages out the H-bond asymmetry and the glass order parameterto zero at long-enough times. The deuteron glass phase is nonergodic,showing a frozen-in disorder at times t << [tau]_exch, whereas for times long compared to [tau]_exch, ergodicity is restored.
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