Crossover from Fragile to Strong Glassy Behaviour in Kinetically Constrained Systems

Details Crossover from Fragile to Strong Glassy Behaviour in Kinetically Constrained Systems Crossover from Fragile to Strong Glassy Behaviour in Kinetically Constrained Systems

2001-04-18

arxiv.org/abs/cond-mat/0104340v1

Phys. Rev. E 64, 21505 (2001)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevE.64.021505

We show the existence of fragile-to-strong transitions in kinetically constrained systems by studying the equilibrium and out-of-equilibrium dynamics of a generic constrained Ising spin chain which interpolates between the symmetric and fully asymmetric cases. We find that for large but finite asymmetry the model displays a crossover from fragile to strong glassy behaviour at finite temperature, which is controlled by the asymmetry parameter. The relaxation in the fragile region presents stretched exponential behaviour, with a temperature dependent stretching exponent which is predicted. Our results are confirmed by numerical simulations.

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