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Structural relaxation is a scale-free process.

Anaël Lemaître1

  • 1Université Paris-Est, Laboratoire Navier (UMR 8205), CNRS, ENPC, IFSTTAR, 2 allée Képler, F-77420 Marne-la-Valle, France.

Physical Review Letters
|December 27, 2014
PubMed
Summary

Structural relaxation in supercooled liquids occurs through Eshelby events. These events, characterized by stress correlations, exhibit power-law spatial correlations peaking at the alpha relaxation time, challenging the notion of a decorrelation length scale.

Area of Science:

  • Condensed matter physics
  • Materials science
  • Statistical mechanics

Background:

  • Supercooled liquids exhibit complex structural dynamics near the glass transition.
  • Understanding relaxation mechanisms is crucial for predicting material properties.

Purpose of the Study:

  • To investigate the nature of structural relaxation in deeply supercooled liquids.
  • To characterize the role of local rearrangements and stress fields in the relaxation process.

Main Methods:

  • Development of an analytical framework using tensorial observables.
  • Analysis of numerical simulations to probe correlations of Eshelby events.
  • Utilizing local stress data to identify and analyze event correlations.

Main Results:

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  • Structural relaxation is driven by the accumulation of Eshelby events.
  • Eshelby events create long-ranged, anisotropic stresses.
  • Events show power-law spatial correlations with time-dependent amplitude peaking at the alpha relaxation time.
  • Stress fluctuations play a key role in facilitating relaxation near the glass transition.

Conclusions:

  • The study reveals a new mechanism for structural relaxation in supercooled liquids.
  • Findings challenge existing theories regarding decorrelation length scales in relaxation processes.
  • The framework provides new tools for analyzing complex dynamics in disordered materials.