Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-01-23
J.Chem.Phys. 120, 10666 (2004)
Physics
Condensed Matter
Statistical Mechanics
17 pages, 10 figures; accepted version, minor corrections
Scientific paper
10.1063/1.1736628
The concept of fragility provides a possibility to rank different supercooled liquids on the basis of the temperature dependence of dynamic and/or thermodynamic quantities. We recall here the definitions of kinetic and thermodynamic fragility proposed in the last years and discuss their interrelations. At the same time we analyze some recently introduced models for the statistical properties of the potential energy landscape. Building on the Adam-Gibbs relation, which connects structural relaxation times to configurational entropy, we analyze the relation between statistical properties of the landscape and fragility. We call attention to the fact that the knowledge of number, energy depth and shape of the basins of the potential energy landscape may not be sufficient for predicting fragility. Finally, we discuss two different possibilities for generating strong behavior.
Michele Carlo de
Ruocco Giancarlo
Sciortino Francesco
Scopigno Tullio
Zamponi Francesco
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