Configuration space connectivity across the fragile to strong transition in silica
Abstract
We present a numerical analysis for SiO2 of the fraction of diffusive direction fdiff for temperatures T on both sides of the fragile-to-strong crossover. The T-dependence of fdiff clearly reveals this change in dynamical behavior. We find that for T above the crossover (fragile region) the system is always close to ridges of the potential energy surface (PES), while below the crossover (strong region), the system mostly explores the PES local minima. Despite this difference, the power law dependence of fdiff on the diffusion constant, as well as the power law dependence of fdiff on the configurational entropy, shows no change at the fragile to strong crossover.
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