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• W2010493886 abstract "The orientational glass transition in a (${mathrm{NH}}_{4}$I${)}_{0.44}$(KI${)}_{0.56}$ single crystal has been studied by two-dimensional quadrupole perturbed $^{14}mathrm{N}$ NMR spectroscopy and $^{14}mathrm{N}$ spin-lattice relaxation time ${mathit{T}}_{1}$ measurements. A $^{14}mathrm{N}$ ${mathit{T}}_{1}$ minimum was found at 9 K. The $^{14}mathrm{N}$ inhomogeneous linewidth starts to increase strongly with decreasing T already below 50 K, i.e., on the high-temperature side of the ${mathit{T}}_{1}$ minimum, demonstrating a breaking of the local cubic symmetry and the onset of the orientational glass transition in the fast motion regime. The $^{14}mathrm{N}$ magnetization recovery also changes from monoexponential to stretched-exponential below 50 K due to the development of spatial inhomogeneities in the sample as a result of a local glassy freeze-out. Both effects can be described by the presence of a local polarization distribution function W(p) with a nonzero second moment ${mathit{M}}_{2}$ below 50 K. The temperature dependence of the $^{14}mathrm{N}$ ${mathit{M}}_{2}$, which is proportional to the Edwards-Anderson order parameter, shows that the glass transition is of the random-bond--random-field type. The random bond contribution is about three times stronger than the random-field one." @default.
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• W2010493886 date "1995-12-01" @default.
• W2010493886 modified "2023-10-01" @default.
• W2010493886 title "N14NMR study of the glass transition in (NH4I)0.44(KI)0.56" @default.
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• W2010493886 doi "https://doi.org/10.1103/physrevb.52.15217" @default.
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