Physics – Condensed Matter – Materials Science
Scientific paper
2000-04-05
Physics
Condensed Matter
Materials Science
4 pages, 4 figures; changed abstract and references; corrected figure 4
Scientific paper
10.1209/epl/i2001-00196-9
By means of NMR experiment and MD computer simulation we investigate the dynamical properties of a chloroadamantane orientationally disordered crystal. We find a plastic-plastic dynamical transition at T_x ~ 330 K in the pico-nanosecond regime. It is interpreted as the rotational analogue of the Goldstein crossing temperature between quasi-free diffusion and activated regime predicted in liquids. Below T_x, NMR experimental data are well described by a Frenkel model corresponding to a strongly anisotropic motion. At higher temperatures, a drastic deviation is observed toward quasi-isotropic rotational diffusion. Close to T_x, we observe that two-step relaxations emerge. An interpretation which is based on the present study of a specific heat anomaly detected by a recent calorimetric experiment is proposed.
Affouard Frederic
Cochin E.
Decressain R.
Descamps Marc
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