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Fragile glasses associated with a dramatic drop of entropy under supercooling

Lee, Chun-Shing, Lulli, Matteo, Zhang, Ling-Han, Deng, Hai-Yao ORCID: and Lam, Chi-Hang 2020. Fragile glasses associated with a dramatic drop of entropy under supercooling. Physical Review Letters 125 (26-31) , 265703. 10.1103/PhysRevLett.125.265703
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We perform kinetic Monte Carlo simulations of a distinguishable-particle lattice model of structural glasses with random particle interactions. By varying the interaction distribution and the average particle hopping energy barrier, we obtain an extraordinary wide range of kinetic fragility. A stretching exponent, characterizing structural relaxation, is found to decrease with the kinetic fragility in agreement with experiments. The most fragile glasses are those exhibiting low hopping barriers and, more importantly, dramatic drops of entropies upon cooling towards the glass transition temperatures. The entropy drops reduce possible kinetic pathways and lead to dramatic slowdowns in the dynamics. In addition, the kinetic fragility is shown to correlate with a thermodynamic fragility.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Physical Society
ISSN: 0031-9007
Date of First Compliant Deposit: 2 December 2020
Date of Acceptance: 23 November 2020
Last Modified: 11 Oct 2023 20:21

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