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Dynamic-to-static crossover in the acoustic attenuation of v-GeO2 (Articolo in rivista)

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Dynamic-to-static crossover in the acoustic attenuation of v-GeO2 (Articolo in rivista) (literal)

Anno

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Alternative label

Baldi, G; Benassi, P; Bove, LE; Caponi, S; Fabiani, E; Fioretto, D; Fontana, A; Giugni, A; Nardone, M; Sampoli, M; Scarponi, F (2007)
Dynamic-to-static crossover in the acoustic attenuation of v-GeO2
in Europhysics letters (Print); IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Baldi, G; Benassi, P; Bove, LE; Caponi, S; Fabiani, E; Fioretto, D; Fontana, A; Giugni, A; Nardone, M; Sampoli, M; Scarponi, F (literal)

Pagina inizio

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http://epljournal.edpsciences.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/epl/abs/2007/09/epl10235/epl10235.html (literal)

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Rivista

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Note

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Univ Trent, Dipartimento Fis, I-38050 Trento, Italy; Univ Aquila, Dipartimento Fis, I-67010 Coppito, LAquila, Italy; Univ Paris 06, CNRS, IMPMC, Dept Phys Milieux Denses, F-75015 Paris, France; Inst Biol Struct, Univ Grenoble 1, Grenoble 9, France; Inst Max Von Laue Paul Langevin, Univ Grenoble 1, Grenoble 9, France; Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy; Univ Florence, Dipartimento Energet, I-50139 Florence, Italy; Univ Roma La Sapienza, Res Ctr, SOFT INFM CNR, I-00185 Rome, Italy (literal)

Titolo

Abstract

The acoustic attenuation of vitreous germania (v-GeO2) has been measured over more than three decades in frequency, by means of neutron scattering at high-frequency (THz), visible light scattering and the newly developed technique of Brillouin ultraviolet scattering at lower frequencies (15-50 GHz). The experiments are supported by a molecular dynamics study of a simulated sample of v-GeO2. The temperature dependence, from 80 K up to the glass transition temperature, shows a persistence of the dynamical nature of the attenuation in the GHz range and a simultaneous increase of the contribution coming from the structural disorder. At higher frequencies clear evidences of a crossover to a region where the attenuation is induced only by the topological disorder are found. (literal)

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