Comment on "Theory of electron energy loss in a random system of spheres"

Details Comment on "Theory of electron energy loss in a random system of spheres" Comment on "Theory of electron energy loss in a random system of spheres"

1996-09-06

arxiv.org/abs/cond-mat/9609071v1

Physics

Condensed Matter

7 pages, plain RevTeX

Scientific paper

In a recent paper, Barrera and Fuchs [Phys. Rev. B 52, 3256 (1995)] provide a theory of electron energy loss in a random system of spheres. In this comment, we point out that the approach of Barrera and Fuchs (A) completely ignores magnetic excitations and retardation, which is inconsistent with the data of energy loss of fast electrons, (B) does not yield the correct k-->0 limit, hence, does not recover correctly the Maxwell-Garnett formula, and (C) does not use the correct screened potential at any k.

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