Onset of slow dynamics in difluorotetrachloroethane glassy crystal

Details Onset of slow dynamics in difluorotetrachloroethane glassy crystal Onset of slow dynamics in difluorotetrachloroethane glassy crystal

2005-02-17

arxiv.org/abs/cond-mat/0502416v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1063/1.1990111

Complementary Neutron Spin Echo and X-ray experiments and Molecular Dynamics simulations have been performed on difluorotetrachloroethane (CFCl2-CFCl2) glassy crystal. Static, single-molecule reorientational dynamics and collective dynamics properties are investigated. The orientational disorder is characterized at different temperatures and a change in nature of rotational dynamics is observed. We show that dynamics can be described by some scaling predictions of the Mode Coupling Theory (MCT) and a critical temperature $T_{c}$ is determined. Our results also confirm the strong analogy between molecular liquids and plastic crystals for which $\alpha$-relaxation times and non-ergodicity parameters are controlled by the non trivial static correlations as predicted by MCT.

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