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Acoustic dynamics of network-forming glasses at mesoscopic wavelengths

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 l...

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Autores principales: Ferrante, C., Pontecorvo, E., Cerullo, G., Chiasera, A., Ruocco, G., Schirmacher, W., Scopigno, T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3644106/
https://www.ncbi.nlm.nih.gov/pubmed/23653205
http://dx.doi.org/10.1038/ncomms2826
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author Ferrante, C.
Pontecorvo, E.
Cerullo, G.
Chiasera, A.
Ruocco, G.
Schirmacher, W.
Scopigno, T.
author_facet Ferrante, C.
Pontecorvo, E.
Cerullo, G.
Chiasera, A.
Ruocco, G.
Schirmacher, W.
Scopigno, T.
author_sort Ferrante, C.
collection PubMed
description 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 v(3/2) 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.
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spelling pubmed-36441062013-05-17 Acoustic dynamics of network-forming glasses at mesoscopic wavelengths Ferrante, C. Pontecorvo, E. Cerullo, G. Chiasera, A. Ruocco, G. Schirmacher, W. Scopigno, T. Nat Commun Article 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 v(3/2) 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. Nature Pub. Group 2013-04-30 /pmc/articles/PMC3644106/ /pubmed/23653205 http://dx.doi.org/10.1038/ncomms2826 Text en Copyright © 2013, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by-nc-nd/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivative Works 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/
spellingShingle Article
Ferrante, C.
Pontecorvo, E.
Cerullo, G.
Chiasera, A.
Ruocco, G.
Schirmacher, W.
Scopigno, T.
Acoustic dynamics of network-forming glasses at mesoscopic wavelengths
title Acoustic dynamics of network-forming glasses at mesoscopic wavelengths
title_full Acoustic dynamics of network-forming glasses at mesoscopic wavelengths
title_fullStr Acoustic dynamics of network-forming glasses at mesoscopic wavelengths
title_full_unstemmed Acoustic dynamics of network-forming glasses at mesoscopic wavelengths
title_short Acoustic dynamics of network-forming glasses at mesoscopic wavelengths
title_sort acoustic dynamics of network-forming glasses at mesoscopic wavelengths
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3644106/
https://www.ncbi.nlm.nih.gov/pubmed/23653205
http://dx.doi.org/10.1038/ncomms2826
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