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Sound attenuation in stable glasses.

Lijin Wang1, Ludovic Berthier2, Elijah Flenner3

  • 1Beijing Computational Science Research Center, Beijing 100193, P. R. China. pguan@csrc.ac.cn and Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA. flennere@gmail.com.

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This summary is machine-generated.

Amorphous solids exhibit stronger sound damping than crystalline solids due to phonon interactions. This study reveals a direct link between glass stability and sound attenuation, clarifying universal low-temperature properties.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Acoustics

Background:

  • Amorphous solids show stronger low-temperature sound damping than crystalline solids.
  • Rayleigh scattering (quartic wavevector scaling) is the proposed mechanism for sound attenuation in glasses.
  • Conflicting results from modern simulations challenge the established sound attenuation model.

Purpose of the Study:

  • To microscopically analyze sound damping in model glass formers.
  • To investigate the relationship between glass stability and sound attenuation.
  • To validate or refute the quartic scaling theory for sound attenuation in amorphous solids.

Main Methods:

  • Simulations of glasses with a wide range of stabilities.
  • Microscopic analysis of sound damping.
  • Varying experimentally relevant preparation protocols.

Main Results:

  • Quartic wavevector scaling of sound attenuation is confirmed for small wavevectors, independent of glass stability.
  • Increasing glass stability shifts the onset of quartic scaling to higher wavevectors.
  • Higher glass stability leads to a significant decrease (over an order of magnitude) in sound attenuation.

Conclusions:

  • Glass stability is intimately connected to sound damping properties.
  • The findings provide a clearer understanding of low-temperature acoustic properties in amorphous solids.
  • This work reconciles simulation discrepancies and supports the role of phonon damping mechanisms in glasses.