The results of a combined experimental study of the high-frequency acoustic dynamics and of the vibrational density of states (VDOS) as a function of temperature in a glass of sorbitol are reported here. The excess in the VDOS at ∼4.5 meV over the Debye, elastic continuum prediction (boson peak) is found to be clearly related to anomalies observed in the acoustic dispersion curve in the mesoscopic wavenumber range of few nm^{−1}. The quasiharmonic temperature dependence of the acoustic dispersion curves offers a natural explanation for the observed scaling of the boson peak with the elastic medium properties.
The results of a combined experimental study of the high-frequency acoustic dynamics and of the vibrational density of states (VDOS) as a function of temperature in a glass of sorbitol are reported here. The excess in the VDOS at similar to 4.5 meV over the Debye, elastic continuum prediction (boson peak) is found to be clearly related to anomalies observed in the acoustic dispersion curve in the mesoscopic wavenumber range of few nm(-1). The quasiharmonic temperature dependence of the acoustic dispersion curves offers a natural explanation for the observed scaling of the boson peak with the elastic medium properties.
Communication: High-frequency acoustic excitations and boson peak in glasses: A study of their temperature dependence / Ruta, B.; Baldi, G.; Giordano, V.M.; Orsingher, L.; Rols, S.; Scarponi, F.; Monaco, G.. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 133:4(2010), pp. 041101.041101-1-041101.041101-4.
Scheda prodotto non validato
I dati visualizzati non sono stati ancora sottoposti a validazione formale da parte dello Staff di IRIS, ma sono stati ugualmente trasmessi al Sito Docente Cineca (Loginmiur).
Titolo: | Communication: High-frequency acoustic excitations and boson peak in glasses: A study of their temperature dependence | |
Autori: | Ruta, B.; Baldi, G.; Giordano, V.M.; Orsingher, L.; Rols, S.; Scarponi, F.; Monaco, G. | |
Autori Unitn: | ||
Titolo del periodico: | THE JOURNAL OF CHEMICAL PHYSICS | |
Anno di pubblicazione: | 2010 | |
Numero e parte del fascicolo: | 4 | |
Codice identificativo Scopus: | 2-s2.0-77955684993 | |
Codice identificativo WOS: | WOS:000280854600001 | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1063/1.3460815 | |
Handle: | http://hdl.handle.net/11572/173691 | |
Citazione: | Communication: High-frequency acoustic excitations and boson peak in glasses: A study of their temperature dependence / Ruta, B.; Baldi, G.; Giordano, V.M.; Orsingher, L.; Rols, S.; Scarponi, F.; Monaco, G.. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 133:4(2010), pp. 041101.041101-1-041101.041101-4. | |
Appare nelle tipologie: |