Relaxation Decoupling in Metallic Glasses at Low Temperatures

Upon cooling, glass-forming liquids experience a dynamic decoupling in the fast β and slow α process, which has greatly influenced glass physics. By exploring an extremely wide temporal and temperature range, we find a surprising gradual change of the relaxation profile from a single-step to a two-s...

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Bibliographic Details
Published in:Physical review letters 2017-05, Vol.118 (22), p.225901-225901, Article 225901
Main Authors: Luo, P, Wen, P, Bai, H Y, Ruta, B, Wang, W H
Format: Article
Language:English
Subjects:
Condensed Matter
Materials Science
Physics
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Summary:Upon cooling, glass-forming liquids experience a dynamic decoupling in the fast β and slow α process, which has greatly influenced glass physics. By exploring an extremely wide temporal and temperature range, we find a surprising gradual change of the relaxation profile from a single-step to a two-step decay upon cooling in various metallic glasses. This behavior implies a decoupling of the relaxation in two different processes in a glass state: a faster one likely related to the anomalous stress-dominated microscopic dynamics, and a slower one associated with subdiffusive motion at larger scales with a broader distribution of relaxation times.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.118.225901