Is there something of the MCT in orientationally disordered crystals ?
arXiv:cond-mat/0012388 · doi:10.1103/PhysRevLett.87.035501
Abstract
Molecular Dynamics simulations have been performed on the orientationally disordered crystal chloroadamantane: a model system where dynamics are almost completely controlled by rotations. A critical temperature T_c = 225 K as predicted by the Mode Coupling Theory can be clearly determined both in the alpha and beta dynamical regimes. This investigation also shows the existence of a second remarkable dynamical crossover at the temperature T_x > T_c consistent with a previous NMR and MD study [1]. This allows us to confirm clearly the existence of a 'landscape-influenced' regime occurring in the temperature range [T_c-T_x] as recently proposed [2,3].
4 pages, 5 figures, REVTEX4
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- Analogy of the slow dynamics between the supercooled liquid and the supercooled plastic crystal states of difluorotetrachloroethane
- Dynamic characterization of crystalline and glass phases of deuterated 1,1,2,2 Tetrachloroethane
- Glass transition in systems without static correlations: a microscopic theory
- Microscopic theory of glassy dynamics and glass transition for molecular crystals
- Microscopic Dynamics of Hard Ellipsoids in their Liquid and Glassy Phase
- Glassy behavior of molecular crystals: A comparison between results from MD-simulation and mode coupling theory
- 'Boson peak' and high-frequency excitations in glassy crystals