Comment on "Collective dynamics in liquid lithium, sodium, and aluminum"

Details Comment on "Collective dynamics in liquid lithium, sodium, and aluminum" Comment on "Collective dynamics in liquid lithium, sodium, and aluminum"

2004-06-04

arxiv.org/abs/cond-mat/0406108v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 1 figure, to appear in PRE (scheduled in 1 June issue)

Scientific paper

10.1103/PhysRevE.70.013201

In a recent paper, S. Singh and K. Tankeshwar (ST), [Phys. Rev. E \textbf{67}, 012201 (2003)], proposed a new interpretation of the collective dynamics in liquid metals, and, in particular, of the relaxation mechanisms ruling the density fluctuations propagation. At variance with both the predictions of the current literature and the results of recent Inelastic X-ray Scattering (IXS) experiments, ST associate the quasielastic component of the $S(Q,\omega)$ to the thermal relaxation, as it holds in an ordinary adiabatic hydrodynamics valid for non-conductive liquids and in the $Q \to 0$ limit. We show here that this interpretation leads to a non-physical behaviour of different thermodynamic and transport parameters.

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