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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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| Authors: |
Lee, S. J. [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)];
Hong, S. Y. [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)];
Fisher, I. R. [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)];
Canfield, P. C. [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)];
Harmon, B. N. [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)];
Lynch, D. W. [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)]
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| Publication Date: | 2000 Apr 15 |
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| OSTI Identifier: | 20216106 |
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| Resource Type: | Journal Article |
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| Resource Relation: | Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 61; Journal Issue: 15; Other Information: PBD: 15 Apr 2000 |
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| Country of Publication: | United States |
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| Language: | English |
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| Format: | Size: page(s) 10076-10083 |
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| Other Number(s): | Journal ID: ISSN 1098-0121; TRN: US00Z1095 |
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| Subject: | 36 MATERIALS SCIENCE; LUTETIUM ALLOYS; ALUMINIUM ALLOYS; YTTERBIUM ALLOYS; ELECTRONIC STRUCTURE; OPTICAL PROPERTIES; OXIDATION; INTERMETALLIC COMPOUNDS; ENERGY-LEVEL DENSITY; MUFFIN-TIN POTENTIAL; EXPERIMENTAL DATA |
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| Update Date: | 2010 Jun 03 |
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