Electron momentum density in Ni75Cu25 and Ni75Co25 disordered alloys: a high-resolution Compton-scattering study

We report high-resolution Compton profiles (CPs) of Ni75Cu25 and Ni75Co25 disordered, ferromagnetic alloys measured along [100], [110] and [111] crystallographic directions. The directional CP anisotropies, profile derivatives and reciprocal form factors B(z) are analysed in detail and compared with...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2005-10, Vol.17 (41), p.6425-6434
Main Authors: Kwiatkowska, J, Dobrzyński, L, Andrejczuk, A, Żukowski, E, Bellin, Ch, Loupias, G, Shukla, A, Buslaps, Th
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other interactions of matter with particles and radiation
Physics
X-ray scattering
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Summary:We report high-resolution Compton profiles (CPs) of Ni75Cu25 and Ni75Co25 disordered, ferromagnetic alloys measured along [100], [110] and [111] crystallographic directions. The directional CP anisotropies, profile derivatives and reciprocal form factors B(z) are analysed in detail and compared with first-principles KKR-CPA (Korringa-Kohn-Rostoker coherent potential approximation) calculations. Good overall agreement is found between the experimental and theoretical anisotropies. It follows from experiment that the majority-spin Fermi surface of the Ni75Cu25 and Ni75Co25 alloys occurs at higher momentum than the theory predicts. Also, a splitting in the secondary maxima in experimental B(z) functions of the alloys is observed, which is not predicted by the KKR-CPA calculations.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/17/41/013