Fragile Glasses Associated with a Dramatic Drop of Entropy under Supercooling

Chun Shing Lee, Matteo Lulli, Ling Han Zhang, Hai Yao Deng, Chi Hang Lam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

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 extraordinarily 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 toward 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.

Original languageEnglish
Article number265703
JournalPhysical Review Letters
Volume125
Issue number26
DOIs
Publication statusPublished - 29 Dec 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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