On the analysis of the vibrational Boson peak and low-energy excitations in glasses (Articolo in rivista)

Type
Label
  • On the analysis of the vibrational Boson peak and low-energy excitations in glasses (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Yannopoulos, SN; Andrikopoulos, KS; Ruocco, G (2006)
    On the analysis of the vibrational Boson peak and low-energy excitations in glasses
    in Journal of non-crystalline solids
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Yannopoulos, SN; Andrikopoulos, KS; Ruocco, G (literal)
Pagina inizio
  • 4541 (literal)
Pagina fine
  • 4551 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 352 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Inst Chem Engn & High Temp Chem Proc, Fdn Res & Technol Hellas, GR-26504 Patras, Greece; Aristotle Univ Thessaloniki, Sch Technol, Div Phys, GR-54124 Thessaloniki, Greece; Univ Roma La Sapienza, CRS SOFT, INFM, I-00185 Rome, Italy; Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy (literal)
Titolo
  • On the analysis of the vibrational Boson peak and low-energy excitations in glasses (literal)
Abstract
  • Implications of reduction procedures applied to the low energy part of the vibrational density of states in glasses and supercooled liquids are considered by advancing a detailed comparison between the excess - over the Debye limit - vibrational density of states g(omega) and the frequency-reduced representation g(omega)/omega(2) usually referred to as the Boson peak. Analyzing representative experimental data from inelastic neutron and Raman scattering, we show that reduction procedures distort to a great extent the otherwise symmetric excess density of states. The frequency of the maximum and the intensity of the excess experience dramatic changes; the former is reduced while the latter increases. The frequency and the intensity of the Boson peak are also sensitive to the distribution of the excess. In the light of the critical appraisal between the two forms of the density of states (i.e. the excess and the frequency-reduced one) we discuss changes of the Boson peak spectral features that are induced under the presence of external stimuli such as temperature (quenching rate, annealing), pressure, and irradiation. The majority of the Boson peak changes induced by the presence of those stimuli can be reasonably traced back to simple and expected modifications of the excess density of states and can be quite satisfactorily accounted for by the Euclidean random matrix theory. Parallels to the heat capacity 'Boson peak' are also briefly discussed. (c) 2006 Elsevier B.V. All rights reserved. (literal)
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