Electron states and magnetic phase diagrams of strongly correlated systems

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.

Physics of Metals and Metallography, special issue, 4 pages

References in corpus (1)

• Fermi surface reconstruction in hole-doped t-J models without long-range antiferromagnetic order

Cited by in corpus (4)

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• Incommensurate magnetic order in rare earth and transition metal compounds with local moments
• Phase separation and pairing fluctuations in oxide materials
• Frequency dependence of temporal spin stiffness and short-range magnetic order in the doped two-dimensional Hubbard model