Heterogeneous shear elasticity of glasses: The origin of the boson peak

Handle URI:
http://hdl.handle.net/10754/325379
Title:
Heterogeneous shear elasticity of glasses: The origin of the boson peak
Authors:
Marruzzo, Alessia; Schirmacher, Walter; Fratalocchi, Andrea ( 0000-0001-6769-4439 ) ; Ruocco, Giancarlo
Abstract:
The local elasticity of glasses is known to be inhomogeneous on a microscopic scale compared to that of crystalline materials. Their vibrational spectrum strongly deviates from that expected from Debye's elasticity theory: The density of states deviates from Debye's law, the sound velocity shows a negative dispersion in the boson-peak frequency regime and there is a strong increase of the sound attenuation near the boson-peak frequency. By comparing a mean-field theory of shear-elastic heterogeneity with a large-scale simulation of a soft-sphere glass we demonstrate that the observed anomalies in glasses are caused by elastic heterogeneity. By observing that the macroscopic bulk modulus is frequency independent we show that the boson-peak-related vibrational anomalies are predominantly due to the spatially fluctuating microscopic shear stresses. It is demonstrated that the boson-peak arises from the steep increase of the sound attenuation at a frequency which marks the transition from wave-like excitations to disorder-dominated ones.
KAUST Department:
PRIMALIGHT Research Group
Citation:
Marruzzo A, Schirmacher W, Fratalocchi A, Ruocco G (2013) Heterogeneous shear elasticity of glasses: the origin of the boson peak. Sci Rep 3. doi:10.1038/srep01407.
Publisher:
Nature Publishing Group
Journal:
Scientific Reports
Issue Date:
8-Mar-2013
DOI:
10.1038/srep01407
PubMed ID:
23470597
PubMed Central ID:
PMC3591752
Type:
Article
ISSN:
20452322
Appears in Collections:
Articles; PRIMALIGHT Research Group

Full metadata record

DC FieldValue Language
dc.contributor.authorMarruzzo, Alessiaen
dc.contributor.authorSchirmacher, Walteren
dc.contributor.authorFratalocchi, Andreaen
dc.contributor.authorRuocco, Giancarloen
dc.date.accessioned2014-08-27T09:49:57Z-
dc.date.available2014-08-27T09:49:57Z-
dc.date.issued2013-03-08en
dc.identifier.citationMarruzzo A, Schirmacher W, Fratalocchi A, Ruocco G (2013) Heterogeneous shear elasticity of glasses: the origin of the boson peak. Sci Rep 3. doi:10.1038/srep01407.en
dc.identifier.issn20452322en
dc.identifier.pmid23470597en
dc.identifier.doi10.1038/srep01407en
dc.identifier.urihttp://hdl.handle.net/10754/325379en
dc.description.abstractThe local elasticity of glasses is known to be inhomogeneous on a microscopic scale compared to that of crystalline materials. Their vibrational spectrum strongly deviates from that expected from Debye's elasticity theory: The density of states deviates from Debye's law, the sound velocity shows a negative dispersion in the boson-peak frequency regime and there is a strong increase of the sound attenuation near the boson-peak frequency. By comparing a mean-field theory of shear-elastic heterogeneity with a large-scale simulation of a soft-sphere glass we demonstrate that the observed anomalies in glasses are caused by elastic heterogeneity. By observing that the macroscopic bulk modulus is frequency independent we show that the boson-peak-related vibrational anomalies are predominantly due to the spatially fluctuating microscopic shear stresses. It is demonstrated that the boson-peak arises from the steep increase of the sound attenuation at a frequency which marks the transition from wave-like excitations to disorder-dominated ones.en
dc.language.isoenen
dc.publisherNature Publishing Groupen
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.titleHeterogeneous shear elasticity of glasses: The origin of the boson peaken
dc.typeArticleen
dc.contributor.departmentPRIMALIGHT Research Groupen
dc.identifier.journalScientific Reportsen
dc.identifier.pmcidPMC3591752en
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDipartimento di Fisica, Universit di Roma la Sapienza, P'le Aldo Moro 2, I-00185, Roma, Italyen
dc.contributor.institutionInstitut fr Physik, Universitt Mainz, Staudinger Weg 7, D-55099 Mainz, Germanyen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorFratalocchi, Andreaen
kaust.authorMarruzzo, Alessiaen

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