Document Type

Article

Publication Date

5-1989

Journal or Book Title

Physical Review B

Volume

39

Issue

14

First Page

9882

Last Page

9887

DOI

10.1103/PhysRevB.39.9882

Abstract

Ellipsometric measurements of the complex dielectric functions of Ni and Ni1−cCuc alloys (c=0.1,0.3,0.4) have been carried out in the (1.25.5)-eV region. Two structures in the σ1 spectrum of pure Ni at about 1.5 and 4.7 eV are attributable to direct interband transitions in the band structure of ferromagnetic Ni. As the Cu concentration increases, the 4.7-eV edge (from transitions between the s-d–hybridized bands well below EF and the s-p-like bands above EF, e.g., X1→X’4) shifts to higher energies, while the 1.5-eV edge (from transitions between a p-like band below EF and a dband above EF along the L–W direction, e.g., L’2→L3) remains at the same energy. A structure grows in the (23)-eV region as Cu is added, and it is interpreted to be due to the transitions between the localized Cu subbands. All these observations are in accord with the calculated (coherent-potential-approximation) electronic structure of Ni-Cu alloys.

Comments

This article is from Physical Review B 39 (1989): 9882, doi:10.1103/PhysRevB.39.9882. Posted with permission

Copyright Owner

The American Physical Society

Language

en

File Format

application/pdf

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