Abstract
The optical conductivities of single crystals of LuAl{sub 2} and YbAl{sub 2} were measured by spectroscopic ellipsometry in the energy range of 1.4-5.5 eV for LuAl{sub 2} and 1.4-5.2 eV for YbAl{sub 2}. The optical conductivity spectra of LuAl{sub 2} and YbAl{sub 2} show similar features except for a difference in magnitude. Both have peaks near 1.8-2.1 eV and broad shoulders between 3.0 and 4.0 eV. The shoulder is weaker in YbAl{sub 2}. The band structure, density of states, and optical conductivity were calculated with the tight-binding linear muffin-tin orbital method in the atomic sphere approximation. The calculated optical conductivity with the inclusion of energy-dependent broadening agrees well with the experimental data. Oxidation effects on the surface of the sample were modeled using a three-phase model. The calculated optical conductivity of the clean surface is enhanced over that of the oxidized surface. (c) 2000 The American Physical Society.
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