Correlation between Fast Relaxation, Shear Phonon Propagation, and Dynamic Heterogeneity in Glass-Forming Liquids
Source abstract
Abstract
Fast relaxation is the precursor to α-relaxation, yet its microscopic origin and role in the emergence of glassy dynamics remain elusive. Using inelastic neutron scattering on the fragile glass-former Ca 0.4 K 0.6 (NO 3 ) 1.4, we show that the fast relaxation dynamics are strongly modulated by local structure and exhibit a distinct temperature dependence that correlates with shear phonon propagation and the Arrhenius-to-super-Arrhenius crossover of α-relaxation. These results indicate that fast relaxation arises from the interplay of shear phonon softening and local structural arrangements, serving as the intermediate dynamical process that connects the elastic interactions to kinetic facilitation underlying the emergence of dynamic heterogeneity in supercooled liquids.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Material Dynamics and Properties · Advanced Physical and Chemical Molecular Interactions · Glass properties and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Beckman Institute for Advanced Science and Technology
University of Illinois Urbana─Champaign
Department of Nuclear, Plasma, and Radiological Engineering
Applied Physics Program
University of Michigan
J-PARC Center
Japan Atomic Energy Agency
Institute for Solid State Physics
The University of Tokyo
National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
Department of Nuclear Engineering and Radiological Sciences
Department of Materials Science and Engineering
Funding
Basic Energy Sciences
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