High frequency transverse dynamics in glasses (Articolo in rivista)

Type
Label
  • High frequency transverse dynamics in glasses (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-8984/15/11/345 (literal)
Alternative label
  • T Scopigno1, E Pontecorvo1, R Di Leonardo1, M Krisch2, G Monaco2, G Ruocco1, B Ruzicka1 and F Sette2 (2003)
    High frequency transverse dynamics in glasses
    in Journal of physics. Condensed matter (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • T Scopigno1, E Pontecorvo1, R Di Leonardo1, M Krisch2, G Monaco2, G Ruocco1, B Ruzicka1 and F Sette2 (literal)
Pagina inizio
  • S1269 (literal)
Pagina fine
  • S1278 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 15 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 INFM and Dipartimento di Fisica, Universit´a di Roma La Sapienza, 00185 Roma, Italy 2 European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France (literal)
Titolo
  • High frequency transverse dynamics in glasses (literal)
Abstract
  • The improvement in performance of the inelastic x-ray scattering technique has led to accurate determination of the dynamic structure factors of glassy and liquid glycerol, in the region of exchanged momentum Q = 2-23 nm(-1) and in the temperature range 80-570 K. Thanks to the improved statistical accuracy, it has been possible to identify, in the spectra at the lower temperatures, besides the propagating longitudinal mode, a second non-Q-dispersing peak at (h) over bar Omega(T) approximate to 8.5 meV. We interpret this peak as a signature of the transverse dynamics that, in topologically disordered systems, acquires a longitudinal symmetry component. This assignment is substantiated by the observation that this peak still survives, across the glass transition, in the liquid state, and vanishes when the structural relaxation time tau(alpha) approaches Omega(T)(-1): a behaviour consistent with the condition tau(alpha)Omega(T) >> 1 required for the existence of a non-relaxational transverse-like dynamics in the liquid state. (literal)
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