Experimental evidence for high frequency transverse-like excitations in glasses

Details Experimental evidence for high frequency transverse-like excitations in glasses Experimental evidence for high frequency transverse-like excitations in glasses

2002-05-29

arxiv.org/abs/cond-mat/0205615v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

13 pages, 5 PostScript figures

Scientific paper

The dynamic structure factor of glassy and liquid glycerol has been measured by inelastic X-ray scattering in the exchanged momentum ($Q$) region $Q$=2$\div$23 nm$^{-1}$ and in the temperature range 80$\div$570 K. Beside the propagating longitudinal excitations modes, at low temperature the spectra show a second non $Q$-dispersing peak at $\hbar \Omega_T$$\approx$8.5 meV. We assign this peak to the transverse dynamics that, in topologically disordered systems, acquires a longitudinal symmetry component. This assignment is substantiated by the observation that, in the liquid, this peak vanishes when the structural relaxation time $\tau_\alpha$ approaches $\Omega_T^{-1}$, a behavior consistent with the condition $\tau_\alpha \Omega_T^{-1}$$>>$1 required for the existence of a transverse-like dynamics in the liquid state.

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