Enhanced diffusivity in supercooled liquids

Details Enhanced diffusivity in supercooled liquids Enhanced diffusivity in supercooled liquids

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007njph....9...36r&link_type=abstract

New Journal of Physics, Volume 9, Issue 2, pp. 36 (2007).

Physics

7

Scientific paper

The enhancement of self and probe diffusivity over the Stokes Einstein values by orders of magnitude is observed in the viscous regime of polymers, molecular glass-formers and supercooled metallic systems. We investigate an alternative to identifying enhanced diffusivity with the fast components of the primary structural relaxation process: high translational mobility is being associated with cooperative dynamics in string-like topologies, which is responsible for fast diffusive particle motion and the slow secondary β-relaxation observed below the dynamic crossover temperature in fragile glass-formers. This approach provides a unifying view of diffusivity across the different classes of glass-forming materials.

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