Sound-propagation gap in fluid mixtures

Details Sound-propagation gap in fluid mixtures Sound-propagation gap in fluid mixtures

2005-06-15

arxiv.org/abs/cond-mat/0506350v2

Physical Review A, {\bf 42}, 5015 (1990)

Physics

Condensed Matter

Soft Condensed Matter

Published; withdrawn since ordering in archive gives misleading impression of new publication

Scientific paper

10.1103/PhysRevA.42.5015

We discuss the behavior of the extended sound modes of a dense binary hard-sphere mixture. In a dense simple hard-sphere fluid the Enskog theory predicts a gap in the sound propagation at large wave vectors. In a binary mixture the gap is only present for low concentrations of one of the two species. At intermediate concentrations sound modes are always propagating. This behavior is not affected by the mass difference of the two species, but it only depends on the packing fractions. The gap is absent when the packing fractions are comparable and the mixture structurally resembles a metallic glass.

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