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Acoustic excitations in glassy sorbitol and their relation with the fragility and the boson peak (Articolo in rivista)

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Acoustic excitations in glassy sorbitol and their relation with the fragility and the boson peak (Articolo in rivista) (literal)

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B. Ruta, G. Baldi, F. Scarponi, D. Fioretto, V. M. Giordano, and G. Monaco (2012)
Acoustic excitations in glassy sorbitol and their relation with the fragility and the boson peak
in The Journal of chemical physics; American Institute of Physics, Melville [NY] (Stati Uniti d'America)
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B. Ruta, G. Baldi, F. Scarponi, D. Fioretto, V. M. Giordano, and G. Monaco (literal)

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B.R., G.M.: European Synchrotron Radiation Facility, BP220, F-38043 Grenoble, France G.B.: IMEM-CNR Institute, Parco Area delle Scienze, I-43124 Parma, Italy F.S., D.F.: Department of Physics, Perugia University, Via A. Pascoli, I-06100 Perugia, Italy D.F.: Centro di Eccellenza sui Materiali Innovativi Nanostrutturati (CEMIN), University of Perugia, via Elce di Sotto 8, 06123 Perugia, Italy V.M.G.: LPMCN, Université Claude Bernard Lyon 1 and CNRS, 69622 Villeurbanne, France (literal)

Titolo

Acoustic excitations in glassy sorbitol and their relation with the fragility and the boson peak (literal)

Abstract

We report a detailed analysis of the dynamic structure factor of glassy sorbitol by using inelastic X-ray scattering and previously measured light scattering data [B. Ruta, G. Monaco, F. Scarponi, and D. Fioretto, Philos. Mag. 88, 3939 (2008)]. The thus obtained knowledge on the density-density fluctuations at both the mesoscopic and macroscopic length scale has been used to address two debated topics concerning the vibrational properties of glasses. The relation between the acoustic modes and the universal boson peak (BP) appearing in the vibrational density of states of glasses has been investigated, also in relation with some recent theoretical models. Moreover, the connection between the elastic properties of glasses and the slowing down of the structural relaxation process in supercooled liquids has been scrutinized. For what concerns the first issue, it is here shown that the wave vector dependence of the acoustic excitations can be used, in sorbitol, to quantitatively reproduce the shape of the boson peak, supporting the relation between BP and acoustic modes. For what concerns the second issue, a proper study of elasticity over a wide spatial range is shown to be fundamental in order to investigate the relation between elastic properties and the slowing down of the dynamics in the corresponding supercooled liquid phase. (literal)

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