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Acoustic dynamics of network-forming glasses at mesoscopic wavelengths (Articolo in rivista)

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Acoustic dynamics of network-forming glasses at mesoscopic wavelengths (Articolo in rivista) (literal)

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C. Ferrante, E. Pontecorvo, G. Cerullo, A. Chiasera ,G. Ruocco, W. Schirmacher, T. Scopigno (2013)
Acoustic dynamics of network-forming glasses at mesoscopic wavelengths
in Nature communications; Macmillan Publisher Ltd, London (Regno Unito)
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C. Ferrante, E. Pontecorvo, G. Cerullo, A. Chiasera ,G. Ruocco, W. Schirmacher, T. Scopigno (literal)

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Dipartimento di Fisica, Universitá di Roma 'La Sapienza', I-00185, Roma, Italy C. Ferrante, E. Pontecorvo, G. Ruocco, W. Schirmacher & T. Scopigno IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, P.zza L. da Vinci 32, 20133 Milano, Italy G. Cerullo CNR-IFN CSMFO Lab., Via alla Cascata 56/C, 38123 Trento, Italy A. Chiasera Center for Life Nano Science@Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena, 291-00161 Roma (RM), Italia G. Ruocco Institut für Physik, Universität Mainz, Staudinger Weg 7, D-55099 Mainz, Germany W. Schirmacher IPCF CNR, UOS di Roma, 00185 Roma, Italy T. Scopigno (literal)

Titolo

Acoustic dynamics of network-forming glasses at mesoscopic wavelengths (literal)

Abstract

The lack of long-range structural order in amorphous solids induces well known thermodynamic anomalies, which are the manifestation of distinct peculiarities in the vibrational spectrum. Although the impact of such anomalies vanishes in the long wavelength, elastic continuum limit, it dominates at length scales comparable to interatomic distances, implying an intermediate transition regime still poorly understood. Here we report a study of such mesoscopic domains by means of a broadband version of picosecond photo-acoustics, developed to coherently generate and detect hypersonic sound waves in the sub-THz region with unprecedented sampling efficiency. We identify a temperature-dependent fractal v3/2 frequency behaviour of the sound attenuation, pointing to the presence of marginally stable regions and a transition between the two above mentioned limits. The essential features of this behaviour are captured by a theoretical approach based on random spatial variation of the shear modulus, including anharmonic interactions. (literal)

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