Spatial correlation at the boson peak frequency in amorphous materials.

ABSTRACT: The Boson peak (BP), an excess of vibrational density of states, is ubiquitous for amorphous materials and is believed to hold the key to understanding the dynamics of glass and glass transition. Previous studies have established an energy scale for the BP, which is ~ 1-10 meV or ~ THz in frequency. However, so far, little is known about the momentum dependence or spatial correlation of the BP. Here, we report the observation of the BP in model Zr-Cu-Al metallic glasses over a wide range of momentum transfer, using inelastic neutron scattering, heat capacity, Raman scattering measurements, and molecular dynamics (MD) simulations. The BP energy is largely dispersionless; however, the BP intensity is found to scale with the static structure factor. Additional MD simulations with a generic Le

SUBMITTER: Li XY 

PROVIDER: S-EPMC12827999 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature