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  • Title: Crossover from fragile to strong glassy behavior in kinetically constrained systems.
    Author: Buhot A, Garrahan JP.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2001 Aug; 64(2 Pt 1):021505. PubMed ID: 11497587.
    Abstract:
    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 that 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 behavior at finite temperature, which is controlled by the asymmetry parameter. The relaxation in the fragile region presents stretched exponential behavior, with a temperature dependent stretching exponent that is predicted. Our results are confirmed by numerical simulations.
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