Enhanced diffusivity in supercooled liquids

Ranko Richert, K. Samwer

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46 Scopus citations

Abstract

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 y-relaxation observed below the dynamic crossover temperature in fragile glassformers. This approach provides a unifying view of diffusivity across the different classes of glass-forming materials.

Original languageEnglish (US)
Article number36
JournalNew Journal of Physics
Volume9
DOIs
StatePublished - Feb 23 2007

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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