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Optical properties and electronic structure of single crystals of LuAl 2 and YbAl 2

Optical properties and electronic structure of single crystals of LuAl 2 and YbAl 2 The optical conductivities of single crystals of LuAl 2 and YbAl 2 were measured by spectroscopic ellipsometry in the energy range of 1.4 – 5.5 eV for LuAl 2 and 1.4 – 5.2 eV for YbAl 2 . The optical conductivity spectra of LuAl 2 and YbAl 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 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Optical properties and electronic structure of single crystals of LuAl 2 and YbAl 2

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2000 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.61.10076
Publisher site
See Article on Publisher Site

Abstract

The optical conductivities of single crystals of LuAl 2 and YbAl 2 were measured by spectroscopic ellipsometry in the energy range of 1.4 – 5.5 eV for LuAl 2 and 1.4 – 5.2 eV for YbAl 2 . The optical conductivity spectra of LuAl 2 and YbAl 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 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.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Apr 15, 2000

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