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 Tc is determined. Our results also confirm the strong analogy between molecular liquids and plastic crystals for which α-relaxation times and non-ergodicity parameters are controlled by the non trivial static correlations as predicted by MCT.
@article{arxiv.cond-mat/0502416,
title = {Onset of slow dynamics in difluorotetrachloroethane glassy crystal},
author = {F. Affouard and E. Cochin and F. Danède and R. Decressain and M. Descamps and W. Haeussler},
journal= {arXiv preprint arXiv:cond-mat/0502416},
year = {2009}
}