A semiempirical band structure for ${\mathrm{PtGa}}_2$ was obtained by adjusting the ${\mathrm{AuGa}}_2$ parameters in the mixed-basis band-structure interpolation scheme to obtain agreement between the calculated total density of states (DOS) and x-ray photoemission spectroscopy data. Angle-resolved photoemission spectroscopy data collected from a ${\mathrm{PtGa}}_2$ (111) surface with a noble-gas-discharge lamp as excitation source were used to check the energies of the d bands. The ${\mathrm{PtGa}}_2$ band structure is compared to those of both elemental Pt and Au, and the gold color of ${\mathrm{PtGa}}_2$ is explained in terms of its Au-like DOS.

• Received 2 February 1987

DOI:https://doi.org/10.1103/PhysRevB.36.3099