Abstract
The bulk plasmon excitation anisotropy of Cr${}_{2}$AlC, a nanolaminated ternary carbide, is investigated by electron energy-loss spectroscopy (EELS) and ab initio calculations. Depending on the crystallographic orientation, the valence EELS signal is dominated either by a single plasmon or split into a superposition of two independent plasmons with mutually orthogonal momentum transfers. This splitting arises from the electron-hole interaction anisotropy, important along the hexagonal structure $c$ axis and negligible within the basal plane. It is shown that within the basal plane, the plasmon behavior can be reproduced from an effective medium theory considering Cr${}_{2}$AlC as an atomic scale superlattice built from pure aluminum and CrC planes.
Published Version
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