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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...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Pub. Group
2013
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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. |
format | Online Article Text |
id | pubmed-3644106 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Nature Pub. Group |
record_format | MEDLINE/PubMed |
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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