Crossover between hydrodynamic and kinetic modes in binary liquid alloys (Articolo in rivista)

Type
Label
  • Crossover between hydrodynamic and kinetic modes in binary liquid alloys (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Cazzato, S; Scopigno, T; Bryk, T; Mryglod, I; Ruocco, G (2008)
    Crossover between hydrodynamic and kinetic modes in binary liquid alloys
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Cazzato, S; Scopigno, T; Bryk, T; Mryglod, I; Ruocco, G (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 77 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Cazzato, Stefano; Scopigno, Tullio; Ruocco, Giancarlo] Univ Roma La Sapienza, INFM, CRS SOFT, I-00185 Rome, Italy; [Bryk, Taras; Mryglod, Ihor] Natl Acad Sci Ukraine, Inst Condensed Matter Phys, UA-79011 Lvov, Ukraine (literal)
Titolo
  • Crossover between hydrodynamic and kinetic modes in binary liquid alloys (literal)
Abstract
  • Inelastic x- ray scattering measurements of the dynamic structure factor in liquid Na57K43, which is sensitive to the atomic- scale coarse graining, reveal a sound velocity value exceeding the long wavelength continuum value and indicate the coexistence of two phononlike modes. By applying generalized collective mode analysis scheme, we show that the positive dispersion of the sound velocity occurs in a wavelength region below the crossover from hydrodynamic to atom- type excitations and, therefore, it cannot be explained as sound propagation over the light species ( Na ) network. The present result experimentally proves the existence of positive dispersion in a binary mixture due to a relaxation process, as opposed to fast sound phenomena. (literal)
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