Crossover between hydrodynamic and kinetic modes in binary liquid alloys

Details Crossover between hydrodynamic and kinetic modes in binary liquid alloys Crossover between hydrodynamic and kinetic modes in binary liquid alloys

2008-03-04

arxiv.org/abs/0803.0493v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 8 figures, to appear in "Physical Review B"

Scientific paper

10.1103/PhysRevB.77.094204

Inelastic x-ray scattering (IXS) measurements of the dynamic structure factor in liquid Na57K43, sensitive to the atomic-scale coarse graining, reveal a sound velocity value exceeding the long wavelength, continuum value and indicate the coexistence of two phonon-like modes. Applying Generalized Collective Mode (GCM) 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 can not be explained as sound propagation over the light specie (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.

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