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Journal Article

Microscopic origin of the nonexponential dynamics in a glassy crystal

MPS-Authors
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Zimmermann,  Herbert
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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http://journals.aps.org/prl/pdf/10.1103/PhysRevLett.91.235504
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http://dx.doi.org/10.1103/PhysRevLett.91.235504
(Any fulltext)

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Citation

Winterlich, M., Diezemann, G., Zimmermann, H., & Böhmer, R. (2003). Microscopic origin of the nonexponential dynamics in a glassy crystal. Physical Review Letters, 91: 235504, pp. 1-4. doi:10.1103/PhysRevLett.91.235504.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-125F-D
Abstract
The origin of the slow relaxation and of the dynamic heterogeneity is studied for an orientation-ally disordered crystal, orthocarborane, composed of quasi-icosahedrally shaped molecules. Multidimensional deuteron magnetic resonance reveals that large jump angles dominate their complex, anisotropic reorientational motion. It involves a sequence of small-angle tilts about locally preferred axes as well as symmetry adapted threefold jumps. The intrinsic dynamics of this glassy crystal is nonexponential and can be fully accounted for in terms of the tilt and jump motion.