Distribution of Atoms on Crystallographic Positions in Heusler Alloys $M$MnSb ($M$ = Co, Ni, Cu) and Their Electronic Structure
V. N. Uvarov, N. V. Uvarov
G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03680 Kyiv-142, Ukraine
Received: 02.02.2017. Download: PDF
By means of band calculations within the FLAPW (full-potential linearized augmented-plane-waves) model, the role of mutual atomic substitutions in the formation of energy, charge, and spin characteristics of $M$MnSb alloys ($M$ = Co, Ni, Cu) is clarified. As found, their ground state (with the largest cohesive energy) is realized in the case of the arrangement of $M$ atoms at the crystallographic positions with tetrahedral atomic environment, and their substitution by the manganese or antimony atoms leads to the appearance of metastable phases with high energy-excited state. The exchange of atoms between the positions, which forms the NaCl-type sublattice, does not lead to changes in the energy characteristics and electronic structure of alloys. The nickel- and cobalt-containing alloys in the ground state are semimetals, while the alloys with copper and alloys in a metastable state are metals. For all the alloys, the largest magnetic moment is localized on the manganese atoms.
Key words: band structure calculations, Heusler alloys, electronic structure, magnetic moments, polarized electron states, spintronics.
PACS: 61.50.Lt, 71.15.Ap, 71.15.Mb, 71.30.+h, 75.10.Lp, 75.25.-j, 85.75.-d
Citation: V. N. Uvarov and N. V. Uvarov, Distribution of Atoms on Crystallographic Positions in Heusler Alloys $M$MnSb ($M$ = Co, Ni, Cu) and Their Electronic Structure, Metallofiz. Noveishie Tekhnol., 39, No. 3: 309—321 (2017) (in Russian)