1999/11/02 by G. Ruocco, Giancarlo Ruocco, F. Sette +20
Computer Science · Engineering · Physics and Astronomy · #Disordered Systems and Neural Networks (cond-mat.dis-nn) #Engineering Technology and Methodologies #FOS: Physical sciences #Optical and Acousto-Optic Technologies #Optical measurement and interference techniques #cond-mat.dis-nn
paper · pdf · doi:10.48550/arxiv.cond-mat/9911012
3 pages, 5 Figures, To be published in PRL
arxiv created 1999/11/02 · openalex publication_date 1999/11/02 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The sound attenuation in the THz region is studied down to T=16 K in glassy glycerol by inelastic x-ray scattering. At striking variance with the decrease found below 100 K in the GHz data, the attenuation in the THz range does not show any T dependence. This result i) indicates the presence of two different attenuation mechanisms, active respectively in the high and low frequency limits; ii) demonstrates the non-dynamic origin of the attenuation of THz sound waves, and confirms a similar conclusion obtained in SiO2 glass by molecular dynamics; and iii) supports the low frequency attenuation mechanism proposed by Fabian and Allen (Phys.Rev.Lett. 82, 1478 (1999)).