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Single-parameter aging in a binary Lennard-Jones system.

Saeed Mehri1, Trond S Ingebrigtsen1, Jeppe C Dyre1

  • 1Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark.

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Summary
This summary is machine-generated.

Computer simulations of a binary mixture reveal that physical aging follows a single-parameter scenario, even with large temperature changes. Four monitored quantities show consistent aging behavior, confirming a common material time.

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Area of Science:

  • Condensed Matter Physics
  • Computational Materials Science
  • Statistical Mechanics

Background:

  • Physical aging is a fundamental phenomenon in disordered materials, affecting their properties over time.
  • Previous experimental studies validated a single-parameter aging scenario for small temperature jumps.
  • The Kob-Andersen binary Lennard-Jones mixture is a model system for studying aging dynamics.

Purpose of the Study:

  • To investigate physical aging in a 2:1 Kob-Andersen binary Lennard-Jones mixture using computer simulations.
  • To test the applicability of the single-parameter aging scenario under large temperature variations.
  • To monitor the time evolution of potential energy, virial, average squared force, and Laplacian of potential energy.

Main Methods:

  • Utilized computer simulations of a 2:1 Kob-Andersen binary Lennard-Jones mixture.
  • Initiated simulations from thermal-equilibrium states.
  • Applied significant up and down temperature jumps to observe system response.

Main Results:

  • All four monitored quantities (potential energy, virial, average squared force, Laplacian of potential energy) closely followed the single-parameter aging scenario.
  • This aging behavior was observed despite the use of larger temperature jumps than in typical experiments.
  • The relaxing parts of the monitored quantities were nearly identical across all temperature jumps, indicating a common material time.

Conclusions:

  • The study confirms the validity of the single-parameter aging scenario for physical aging in this model system, even under large temperature perturbations.
  • The findings suggest a robust aging mechanism characterized by a common material time across different physical quantities.
  • This research provides valuable insights into the dynamics of disordered materials and validates simulation approaches for studying aging.