Is there something of the MCT in orientationally disordered crystals ?

Details Is there something of the MCT in orientationally disordered crystals ? Is there something of the MCT in orientationally disordered crystals ?

2000-12-20

arxiv.org/abs/cond-mat/0012388v1

Physics

Condensed Matter

Materials Science

4 pages, 5 figures, REVTEX4

Scientific paper

10.1103/PhysRevLett.87.035501

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].

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