Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-05-13
Physics
Condensed Matter
Statistical Mechanics
Scientific paper
10.1103/PhysRevE.76.052401
We address the interesting temperature range of a glass forming system where the mechanical properties are intermediate between those of a liquid and a solid. We employ an efficient Monte-Carlo method to calculate the elastic moduli, and show that in this range of temperatures the moduli are finite for short times and vanish for long times, where `short' and `long' depend on the temperature. By invoking some exact results from statistical mechanics we offer an alternative method to compute shear moduli using Molecular Dynamics simulations, and compare those to the Monte-Carlo method. The final conclusion is that these systems are not "viscous fluids" in the usual sense, as their actual time-dependence concatenates solid-like materials with varying local shear moduli.
Ilyin Valery
Makedonska Nataliya
Procaccia Itamar
Schupper Nurith
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