Vitrification in a 2D Ising model with mobile bonds |
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Authors: | P Lazić DK Sunko |
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Institution: | (1) Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, POB 331, 10000 Zagreb, Croatia, HR |
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Abstract: | A bond-disordered two-dimensional Ising model is used to simulate Kauzmann's mechanism of vitrification in liquids, by a Glauber
Monte Carlo simulation. The rearrangement of configurations is achieved by allowing impurity bonds to hop to nearest neighbors
at the same rate as the spins flip. For slow cooling, the theoretical minimum energy configuration is approached, characterized
by an amorphous distribution of locally optimally arranged impurity bonds. Rapid cooling to low temperatures regularly finds
bond configurations of higher energy, which are both a priori rare and severely restrictive to spin movement, providing a simple realization of kinetic vitrification. A supercooled liquid
regime is also found, and characterized by a change in sign of the field derivative of the spin-glass susceptibility at a
finite temperature.
Received 3 August 2000 and Received in final form 9 March 2001 |
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Keywords: | PACS 05 10 Ln Monte Carlo methods – 64 70 Pf Glass transitions – 75 10 Nr Spin-glass and other random models |
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