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Magnetic fluctuations and self--energy effects in two--dimensional itinerant systems with van Hove singularity of electronic spectrum
P. A. Igoshev, V. Yu. Irkhin, A. A. Katanin
We investigate a competition of tendencies towards ferromagnetic and incommensurate order in two-dimensional fermionic systems within functional renormalization group technique usi…
Ideas by S.V. Vonsovsky and Modern Model Treatment of Magnetism
V. Yu. Irkhin
A review of fundamental works by Shubin and Vonsovsky on the formulation of the polar and s-d(f) exchange models is given. Their ideas are compared with subsequent developments in…
Ferromagnetism in the Highly-Correlated Hubbard Model
V. Yu. Irkhin, A. V. Zarubin
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 ferromagne…
The Kondo-lattice state and non-Fermi-liquid behavior in the presence of Van Hove singularities
V. Yu. Irkhin
A scaling consideration of the Kondo lattices is performed with account of logarithmic Van Hove singularities (VHS) in the electron density of states. The scaling trajectories are…