Journal Article

PreJuSER-747

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetic phase transition in half-metallic CoMnSb and NiMnSb semi-Heusler alloys upon Cu doping: First-principles calculations

Galanakis, I. ; Sasioglu, E.FZJ* ; Özdogan, K.

2008
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/11085  doi:10.1103/PhysRevB.77.214417

Abstract: We study the effect of the nonmagnetic 3d atoms on the magnetic properties of the half-metallic (HM) semi-Heusler alloys Co1-xCuxMnSb and Ni1-xCuxMnSb (0 <= x <= 1) using first-principles calculations. We determine the magnetic phase diagram of both systems at zero temperature and obtain a phase transition from a ferromagnetic to an antiferromagnetic state. For low Cu concentrations the ferromagnetic Ruderman-Kittel-Kasuya-Yosida (RKKY)-type exchange mechanism dominates, while the antiferromagnetic superexchange coupling becomes important for larger Cu content. A strong dependence of the magnetism in both systems on the position of the Fermi level within the HM gap is found. Obtained results are in good agreement with the available experimental data.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IFF-1)
2. Quanten-Theorie der Materialien (IAS-1)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2008

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