Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-29
Physics
Condensed Matter
Strongly Correlated Electrons
Report on the Moscow International Symposium on Magnetism MISM-2011; final version to appear in JMMM; 4 pages
Scientific paper
The quasistatic approximation and equation-of-motion decoupling for the electron Green's functions are applied to trace the effect of electronic dispersion and electron correlations on the ferromagnetism of two-dimensional itinerant-electron systems. It is found that next-nearest-neighbor hopping t' is of crucial importance for ferromagnetism formation yielding the magnetic phase diagram which is strongly asymmetric with respect to half-filling. At small t' in the vicinity of half-filling the ferromagnetic phase region is restricted by the spin-density wave instability, and far from half-filling by one-particle (spin-polaron) instability. At t' close to t/2 ferromagnetism is stabilized at moderate Hubbard U due to substantial curvature of the Fermi surface which passes in the vicinity of the van Hove singularity points. The results obtained are of possible importance for high-T_c compounds and layered ruthenates.
Igoshev Andrei P.
Irkhin Yu. V.
Katanin Andrey A.
Zarubin A. V.
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