Document Type

Article

Publication Date

4-2000

Journal or Book Title

Physical Review B

Volume

61

Issue

15

First Page

10076

Last Page

10083

DOI

10.1103/PhysRevB.61.10076

Abstract

The optical conductivities of single crystals of LuAl2 and YbAl2 were measured by spectroscopic ellipsometry in the energy range of 1.4–5.5eV for LuAl2 and 1.4–5.2eV for YbAl2. The optical conductivity spectra of LuAl2 and YbAl2 show similar features except for a difference in magnitude. Both have peaks near 1.8–2.1eV and broad shoulders between 3.0 and 4.0eV. The shoulder is weaker in YbAl2. 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.

Comments

This article is from Physical Review B 61 (2000): 10076, doi:10.1103/PhysRevB.61.10076. Posted with permission.

Copyright Owner

The American Physical Society

Language

en

File Format

application/pdf

Share

COinS