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Related Experiment Videos

Frustration and sound attenuation in structural glasses

Angelani1, Montagna, Ruocco

  • 1INFM and Dipartimento di Fisica, Universita di Trento, I-3805, Povo, Trento, Italy.

Physical Review Letters
|September 16, 2000
PubMed
Summary

This study explores how structural disorder affects sound attenuation in materials. High internal stress, or frustration, in glasses correlates with specific sound damping behaviors, impacting high-frequency sound propagation.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Acoustics

Background:

  • Understanding high-frequency sound attenuation is crucial for material characterization.
  • Disorder in material structures significantly influences their physical properties.
  • Previous studies have explored sound attenuation in various disordered systems.

Purpose of the Study:

  • To investigate the impact of different types of disorder on high-frequency sound attenuation.
  • To introduce and quantify 'frustration' as a measure of internal stress in structural glasses.
  • To establish a correlation between frustration levels and sound attenuation mechanisms.

Main Methods:

  • Numerical investigation of three harmonic disorder systems: Lennard-Jones-like glasses, percolators above threshold, and spring disordered lattices.

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  • Introduction of the concept of 'frustration' to quantify internal stress in glasses.
  • Analysis of the momentum dependence of sound attenuation, characterized by the exponent alpha.

    • Main Results:

    • A strong correlation was found between the degree of frustration in glasses and the exponent alpha governing sound attenuation.
    • The exponent alpha decreases with increasing frustration.
    • In low-frustration systems, alpha approaches d+1 (spectral dimension), while in high-frustration systems (realistic glasses), alpha approaches 2.

    Conclusions:

    • Frustration is a key parameter in understanding high-frequency sound attenuation in disordered materials.
    • The degree of internal stress directly influences how sound energy is dissipated.
    • Findings provide insights into the acoustic properties of realistic glasses and other disordered systems.