Document Type

Article

Publication Date

6-1980

Journal or Book Title

Physical Review B

Volume

21

Issue

12

First Page

5505

Last Page

5510

DOI

10.1103/PhysRevB.21.5505

Abstract

The optical constants and their temperature derivatives have been determined for β′−NiAl from absorption and thermoreflectance measurements in the energy range of 0.2-4.4 eV. The results are interpreted using the self-consistent energy bands of Moruzzi, Williams, and Gelatt. By comparing a calculated joint density of states with ε2, the imaginary part of the dielectric function, good overall agreement is found between theory and experiment. In contrast to earlier analyses, it is found that the 2.5-eV peak in ε2 is primarily due to direct interband transitions terminating near the Fermi surface. This new interpretation of the 2.5-eV feature is discussed in relation to previously reported concentration effects and the rigid-band model.

Comments

This article is from Physical Review B 21 (1980): 5505, doi:10.1103/PhysRevB.21.5505. Posted with permission.

Copyright Owner

The American Physical Society

Language

en

File Format

application/pdf

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