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  • Title: Frequency-dependent Stokes-Einstein relation in supercooled liquids.
    Author: Zangi R, Kaufman LJ.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2007 May; 75(5 Pt 1):051501. PubMed ID: 17677067.
    Abstract:
    We investigate by molecular dynamics simulations the validity of the frequency-dependent Stokes-Einstein (SE) relation in supercooled liquids at different temperatures. The results indicate that the SE relation holds at intermediate frequencies that correspond to the beta -relaxation and the onset of the alpha -relaxation regimes. Large deviations, which increase as the temperature decreases, are observed at frequencies well below the frequency at which the non-Gaussian parameter alpha2 is maximum. We argue that the breakdown of the SE relation in supercooled liquids arises from underestimation of the diffusion coefficient due to neglect of correlated motions.
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