Evidence for the weak steric hindrance scenario in the supercooled-state reorientational dynamics

Details Evidence for the weak steric hindrance scenario in the supercooled-state reorientational dynamics Evidence for the weak steric hindrance scenario in the supercooled-state reorientational dynamics

2005-04-27

arxiv.org/abs/cond-mat/0504704v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, Phys. Rev. Lett. in press

Scientific paper

10.1103/PhysRevLett.94.215701

We use molecular-dynamics computer simulations to study the translational and reorientational dynamics of a glass-forming liquid of dumbbells. For sufficiently elongated molecules the standard strong steric hindrance scenario for the rotational dynamics is found. However, for small elongations we find a different scenario -- the weak steric hindrance scenario -- caused by a new type of glass transition in which the orientational dynamics of the molecule's axis undergoes a dynamical transition with a continuous increase of the non-ergodicity parameter. These results are in agreement with the theoretical predictions by the mode-coupling theory for the glass transition.

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