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Optical micrograph of prepared AuAl2 specimen. The major constituent is the purple AuAl2 with a small amount of interdendritic Al as a second phase.
Real (ɛ1, solid curve) and imaginary (ɛ2, short-dashed curve) parts of the dielectric functions for gold intermetallic alloys. Calculated using DFT and the RPA.
Calculated (short-dashed curve) and experimental (solid curve) reflectivity (see Ref. 14) for gold intermetallic alloys. Also shown is the experimental reflectivity for AuAl2 measured in this work (dotted curve).
Calculated (short-dashed curve) and experimental (solid curve) EELS for AuAl2. A bulk plasmon peak is observed at 2 eV.
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