Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 440, Issue -, Pages 66-69Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2016.12.064
Keywords
Magnetic ordering; Electron correlations; Phase separation
Funding
- Ural Branch of Russian Academy of Science [15-8-2-9, 15-8-2-12]
- Russian Foundation for Basic Research [16-02-00995-a]
- Act 211 Government of the Russian Federation [02.A03.21.0006]
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The ground-state magnetic phase diagram is calculated within the Hubbard and s-d exchange (Kondo) models for square and simple cubic lattices vs. band filling and interaction parameter. The difference of the results owing to the presence of localized moments in the latter model is discussed. We employ a generalized HartreeFock approximation (HFA) to treat commensurate ferromagnetic (FM), antiferromagnetic (AFM), and incommensurate (spiral) magnetic phases. The electron correlations are taken into account within the Hubbard model by using the Kotliar-Ruckenstein slave boson approximation (SBA). The main advantage of this approach is a correct qualitative description of the paramagnetic phase: its energy becomes considerably lower as compared with HFA, and the gain in the energy of magnetic phases is substantially reduced.
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