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High frequency dynamics in a monatomic glass

T. Scopigno·R. Di Leonardo·G. Ruocco·A. Q. R. Baron·S. Tsutsui·F. Bossard·S. N. Yannopoulos
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Abstract

The high frequency dynamics of glassy Selenium has been studied by Inelastic X-ray Scattering at beamline BL35XU (SPring-8). The high quality of the data allows one to pinpoint the existence of a dispersing acoustic mode for wavevectors ($Q$) of $1.5<Q<12.5$ nm$^{-1}$, helping to clarify a previous contradiction between experimental and numerical results. The sound velocity shows a positive dispersion, exceeding the hydrodynamic value by $\approx$ 10% at $Q<3.5$ nm$^{-1}$. The $Q^2$ dependence of the sound attenuation $Γ(Q)$, reported for other glasses, is found to be the low-$Q$ limit of a more general $Γ(Q) \propto Ω(Q)^2$ law which applies also to the higher $Q$ region, where $Ω(Q)\propto Q$ no longer holds.

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T. Scopigno, R. Di Leonardo, G. Ruocco, A. Q. R. Baron, S. Tsutsui, F. Bossard, S. N. Yannopoulos. 2003-12-01. High frequency dynamics in a monatomic glass. https://doi.org/10.1103/physrevlett.92.025503

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