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

Zhen Wei Wu (), Walter Kob (), Wei-Hua Wang and Limei Xu ()
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Zhen Wei Wu: Peking University
Walter Kob: University of Montpellier and CNRS
Wei-Hua Wang: Chinese Academy of Sciences
Limei Xu: Peking University

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract The dynamics of glass-forming systems shows a multitude of features that are absent in normal liquids, such as non-exponential relaxation and a strong temperature-dependence of the relaxation time. Connecting these dynamic properties to the microscopic structure of the system is challenging because of the presence of the structural disorder. Here we use computer simulations of a metallic glass-former to establish such a connection. By probing the temperature and wave-vector dependence of the intermediate scattering function we find that the relaxation dynamics of the glassy melt is directly related to the local arrangement of icosahedral structures: Isolated icosahedra give rise to a liquid-like stretched exponential relaxation whereas clusters of icosahedra lead to a compressed exponential relaxation that is reminiscent to the one found in a solid. Our results show that in metallic glass-formers these two types of relaxation processes can coexist and give rise to a dynamics that is surprisingly complex.

Date: 2018
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DOI: 10.1038/s41467-018-07759-w

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