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Excitation Chains at the Glass Transition | J.S. Langer
; | Date: |
27 Jun 2006 | Subject: | Statistical Mechanics; Materials Science | Abstract: | The excitation-chain theory of the glass transition, proposed in an earlier publication, predicts diverging, super-Arrhenius relaxation times and, {it via} a similarly diverging length scale, suggests a way of understanding the relations between dynamic and thermodynamic properties of glass-forming liquids. I argue here that critically large excitation chains play a role roughly analogous to that played by critical clusters in the droplet model of vapor condensation. The chains necessarily induce spatial heterogeneities in the equilibrium states of glassy systems; and these heterogeneities may be related to stretched-exponential relaxation. Unlike a first-order condensation point in a vapor, the glass transition is not a conventional phase transformation, and may not be a thermodynamic transition at all. | Source: | arXiv, cond-mat/0606669 | Services: | Forum | Review | PDF | Favorites |
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