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Relaxation processes in harmonic glasses?

G Ruocco1, F Sette, Di Leonardo R

  • 1INFM and Dipartimento di Fisica, Universitá di L'Aquila, I-67100, L'Aquila, Italy.

Physical Review Letters
|September 16, 2000
PubMed
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A simulated glass exhibits a relaxation process, explaining sound attenuation and dispersion. This microscopic process is linked to the glass

Area of Science:

  • Condensed matter physics
  • Materials science
  • Computational physics

Background:

  • Glasses and supercooled liquids exhibit complex relaxation dynamics.
  • Sound attenuation and dispersion are key phenomena in glassy materials.
  • Microscopic relaxation processes are crucial for understanding material behavior.

Purpose of the Study:

  • To identify and characterize a relaxation process in a simulated harmonic Lennard-Jones glass.
  • To connect this simulated process to the microscopic relaxation observed in real glasses and supercooled liquids.
  • To develop a model that quantitatively relates the process' characteristics to measurable properties.

Main Methods:

  • Molecular dynamics simulations of a harmonic Lennard-Jones glass.
  • Analysis of sound attenuation and sound velocity dispersion.

Related Experiment Videos

  • Application of the memory function approach for theoretical modeling.

    • Main Results:

    • A distinct relaxation process was identified in the simulated glass.
    • This process was successfully linked to the microscopic relaxation observed in real glassy systems.
    • The memory function model accurately predicted the characteristic time and strength of the relaxation process.
    • The model also related the process to the dynamic structure factor and high-frequency sound attenuation.

    Conclusions:

    • The simulated relaxation process provides a model for microscopic relaxation in glasses.
    • The memory function approach is a valid tool for studying these phenomena.
    • The study establishes quantitative links between microscopic dynamics and macroscopic sound properties in glasses.