Sound attenuation in a unexplored frequency region: Brillouin ultraviolet light scattering measurements in v-SiO2
Authors: Benassi P., Caponi S., Eramo R., Fontana A., Giugni A., Nardone M., Sampoli M., Viliani G.
Autors Affiliation: Dipartimento di Fisica, Università dell’Aquila, I-67100 L’Aquila, Italy
Dipartimento di Fisica, Università di Trento, I-38050 Povo Trento, Italy
Dipartimento di Fisica and LENS, Università di Firenze, I-50019 Sesto Fiorentino, Firenze, Italy
Dipartimento di Energetica, Università di Firenze, I-50139, Firenze, Italy
INFM CRS-SOFT, c/o Università di Roma “La Sapienza,” I-00185, Roma, Italy
Abstract: We report ultraviolet Brillouin light-scattering experimental data on v-SiO2 in an unexplored frequency region, performed with a newly available spectrometer, up to exchanged wave vector q values of 0.075 nm−1, at different temperatures. The measured attenuation follows a q2 law and is temperature dependent. Such temperature dependence is found to be in good agreement with that measured at lower q, suggesting that the broadening of the Brillouin peak is mainly due to a dynamic attenuation mechanism. The comparison of the present data with those obtained by inelastic x-ray and visible scattering indicates the existence of a crossover among different attenuation mechanisms, whose nature is briefly discussed.
Journal/Review: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume: 71 (17) Pages from: 172201-1 to: 172201-4
KeyWords: Glass-forming liquids; X-ray-scattering; Vitreous silica; Propagating mides; Vibrational exitations; Supercooled liquids; Transverse dynamics; Acoustic phonons; Boson peak; SystemsDOI: 10.1103/PhysRevB.71.172201Citations: 49data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2023-12-03References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here