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Fast dynamics in a model metallic glass-forming material.

Hao Zhang1, Xinyi Wang1, Hai-Bin Yu2

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Fast dynamics in glass-forming liquids, including beta-relaxation and the boson peak, are explained by string-like particle motion. This study reveals these dynamics persist even in materials exhibiting a fragile-strong transition.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Materials Science

Background:

  • Glass-forming (GF) liquids exhibit universal
  • fast dynamics
  • characterized by β-relaxation and the boson peak.

Purpose of the Study:

  • Investigate fast dynamics in a simulated Al-Sm GF material undergoing a fragile-strong (FS) transition.
  • Clarify the role of string-like particle motion in these dynamics.
  • Determine the origin of the boson peak.

Main Methods:

  • Simulated Al-Sm GF material.
  • Analysis of fast β- and Johari-Goldstein (JG) β-relaxation processes.
  • Calculation of the density of states for stringlet and normal particles.

Main Results:

  • Fast relaxation processes and string-like particle motion (stringlets) are present in GF liquids with FS transitions.
  • Stringlets, associated with localized stable modes, generate the boson peak.
  • Heating softens excitations, decreasing boson peak frequency and shear modulus.

Conclusions:

  • String-like collective motion drives fast dynamics and relaxation in GF liquids.
  • The boson peak originates from stringlet particles, not normal atoms.
  • Relaxation in cooled liquids involves a hierarchy of processes across different timescales and spatial scales.