2003/12/01 by T. Scopigno, R. Di Leonardo, Roberto Di Leonardo +10 · 1 citation
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Glass properties and applications #High-pressure geophysics and materials #Material Dynamics and Properties #cond-mat.dis-nn
paper · pdf · doi:10.1103/physrevlett.92.025503
Phys. Rev. Lett. (Accepted)
arxiv created 2003/12/01 · openalex publication_date 2004/01/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
The high frequency dynamics of glassy selenium has been studied by inelastic x-ray scattering at beam line BL35XU (SPring-8). The high quality of the data allows one to pinpoint the existence of a dispersing acoustic mode for wave vectors (Q) of 1.5<Q<12.5 nm^\ensuremath-1, helping to clarify a previous contradiction between experimental and numerical results. The sound velocity shows a positive dispersion, exceeding the hydrodynamic value by \ensuremath≈10% at Q<3.5 nm^\ensuremath-1. The Q2 dependence of the sound attenuation \ensuremathΓ(Q), reported for other glasses, is found to be the low-Q limit of a more general \ensuremathΓ(Q)\ensuremath∝\ensuremathΩ(Q)2 law, which applies also to the higher Q region, where \ensuremathΩ(Q)\ensuremath∝Q no longer holds.