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American Physical Society, Physical review B, 21(77)

DOI: 10.1103/physrevb.77.214417

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Magnetic phase transition in half-metallic CoMnSb and NiMnSb semi-Heusler alloys upon Cu doping: First-principles calculations

Journal article published in 2008 by I. Galanakis ORCID, E. Şaşıoğlu, K. Özdoğan
This paper is available in a repository.
This paper is available in a repository.

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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.