Microscopic origin of the nonexponential dynamics in a glassy crystal -: art. no. 235504

被引：32

作者：

Winterlich, M ^{[1
]}

Diezemann, G

Zimmermann, H

Böhmer, R

机构：

[1] Univ Dortmund, D-44221 Dortmund, Germany

[2] Johannes Gutenberg Univ Mainz, Inst Phys Chem, D-55099 Mainz, Germany

[3] Max Planck Inst Med Res, D-69120 Heidelberg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.91.235504

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The origin of the slow relaxation and of the dynamic heterogeneity is studied for an orientationally 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.

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页数：4

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