Abstract

We present first-principles computations of ferromagnetic electronic structures and spin-resolved Compton profiles along the three high-symmetry directions in Ni₇₅Cu₂₅ and Ni₇₅Co₂₅ disordered alloys, together with the corresponding Compton measurements from single-crystal specimens with a 137Cs source. The theoretical results are based on the use of the charge- and spin-self-consistent Korringa-Kohn-Rostoker coherent-potential-approximation framework to treat disorder, and the local spin-density scheme for incorporating exchange-correlation effects; the lattice constants in all cases are obtained by minimizing the total energy. The majority-spin spectrum of Ni undergoes relatively small changes upon alloying with Cu or Co, and the associated majority-spin contribution to the Compton profiles of Ni, Ni₇₅Cu₂₅ and Ni₇₅Co₂₅ is nearly the same. In comparing theory and experiment, we focus on anisotropies in Compton profiles, and find the overall agreement with respect to the J₁₁₁-J₁₀₀, J₁₁₁-J₁₁₀, and J₁₁₀-J₁₀₀ anisotropies in Ni₇₅Cu₂₅ as well as Ni₇₅Co₂₅ to be reasonable, although some significant discrepancies around pz=0 are notable. We show clearly that the momentum resolution of 0.4 a.u. (full width at half maximum) of the present experiment washes out some of the fine structure in the Compton spectra, and that these spectral features should be accessible via higher resolution measurements with a synchrotron light source.

Notes

Originally published in Physical Review B v.57 (1998): 314-323. DOI: 10.1103/PhysRevB.57.314

Keywords

ferromagnetic electronic structures, spin-resolved Compton profiles, Ni75Cu25, Ni75Co25

Subject Categories

Alloys, Ferromagnetic materials

Disciplines

Physics

Publisher

American Physical Society

Publication Date

1-1-1998

Rights Information

Copyright 1998 American Physical Society.

Rights Holder

American Physical Society

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