Ferromagnetism in the Highly-Correlated Hubbard Model
V.Yu. Irkhin, A.V. Zarubin
TL;DR
This paper investigates ferromagnetism in the strongly correlated Hubbard model, analyzing stability regions and the influence of density of states singularities on magnetic phases for square and cubic lattices.
Contribution
It provides a detailed calculation of ferromagnetic stability regions using Hubbard's operators and compares results with previous studies, highlighting the role of density of states.
Findings
Stability regions of ferromagnetism mapped in the n-U plane.
Density of states singularities significantly affect magnetic phase diagrams.
Comparison shows consistency and differences with earlier research.
Abstract
The Hubbard model with strong correlations is treated in the many-electron representation of Hubbard's operators. The regions of stability of saturated and non-saturated ferromagnetism in the n-U plane for the square and simple cubic lattices are calculated. The role of the bare density of states singularities for the magnetic phase diagram is discussed. A comparison with the results of previous works is performed.
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