A glass transition scenario based on heterogeneities and entropy barriers

Details A glass transition scenario based on heterogeneities and entropy barriers A glass transition scenario based on heterogeneities and entropy barriers

2001-06-18

arxiv.org/abs/cond-mat/0106328v1

Philosophical Magazine B 82, 143 - 149 (2002)

Physics

Condensed Matter

Soft Condensed Matter

8th International Workshop on Disordered Systems, Andalo (Trento), Italy, 12-15 March 2001

Scientific paper

10.1080/13642810110084920

We propose a scenario for the glass transition based on the cooperative nature of nucleation processes and entropic effects. The main point is the relation between the off-equilibrium energy dissipation and nucleation processes in off-equilibrium supercooled liquids which leads to a natural definition of the complexity. From the absence of coarsening growth we can derive an entropy based fluctuation formula which relates the free energy dissipation rate in the glass with the nucleation rate of the largest cooperative regions. As by-product we obtain a new phenomenological relation between the largest relaxation time in the supercooled liquid phase and an effective temperature. This differs from the Adam-Gibbs relation in that predicts no divergence of the primary relaxation time at the Kauzmann temperature and the existence of a crossover from fragile to strong behavior.

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