Electron States and Magnetic Phase Diagrams of Strongly Correlated Systems
- Authors: Irkhin V.Y.1, Igoshev P.A.1,2
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Affiliations:
- Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
- Ural Federal University Named after the First President of Russia B.N. Yeltsin
- Issue: Vol 119, No 13 (2018)
- Pages: 1267-1271
- Section: Theory of Metals
- URL: https://journals.rcsi.science/0031-918X/article/view/168081
- DOI: https://doi.org/10.1134/S0031918X18130197
- ID: 168081
Cite item
Abstract
Various auxiliary-particle approaches to treat electron correlations in many-electron models are analyzed. Applications to copper-oxide layered systems are discussed. The ground-state magnetic phase diagrams are considered within the Hubbard and \(s\)–\(d\) exchange (Kondo) models for square and simple cubic lattices vs. band filling and interaction parameter. A generalized Hartree–Fock approximation is employed to treat commensurate ferro-, antiferromagnetic, and incommensurate (spiral) magnetic phases, and also magnetic phase separation. The correlations are taken into account within the Hubbard model by using the slave-boson approach. The main advantage of this approach is correct estimating the contribution of doubly occupied states number and therefore the paramagnetic phase energy.
About the authors
V. Yu. Irkhin
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Author for correspondence.
Email: valentin.irkhin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108
P. A. Igoshev
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin
Email: valentin.irkhin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Ekaterinburg, 620002