Stretched and compressed exponentials in the relaxation dynamics of a metallic glass- forming melt - Laboratoire Charles Coulomb (L2C) Accéder directement au contenu
Article Dans Une Revue Nature Communications Année : 2018

Stretched and compressed exponentials in the relaxation dynamics of a metallic glass- forming melt

Zhen Wei Wu
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Walter Kob
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Wei-Hua Wang
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Limei Xu
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Résumé

The dynamics of glass-forming systems shows a multitude of features that are absent innormal liquids, such as non-exponential relaxation and a strong temperature-dependence ofthe relaxation time. Connecting these dynamic properties to the microscopic structure of thesystem is challenging because of the presence of the structural disorder. Here we usecomputer simulations of a metallic glass-former to establish such a connection. By probingthe temperature and wave-vector dependence of the intermediate scattering function wefindthat the relaxation dynamics of the glassy melt is directly related to the local arrangement oficosahedral structures: Isolated icosahedra give rise to a liquid-like stretched exponentialrelaxation whereas clusters of icosahedra lead to a compressed exponential relaxation that isreminiscent to the one found in a solid. Our results show that in metallic glass-formers thesetwo types of relaxation processes can coexist and give rise to a dynamics that is surprisinglycomple
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hal-01981718 , version 1 (09-06-2021)

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Zhen Wei Wu, Walter Kob, Wei-Hua Wang, Limei Xu. Stretched and compressed exponentials in the relaxation dynamics of a metallic glass- forming melt. Nature Communications, 2018, 9, pp.5334. ⟨10.1038/s41467-018-07759-w⟩. ⟨hal-01981718⟩
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