Ferromagnetism, spiral magnetic structures and phase separation in the two-dimensional Hubbard model

P. A. Igoshev, A. V. Zarubin, A. A. Katanin, V. Yu Irkhin

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The quasistatic approximation and equation-of-motion decoupling for the electron Greens 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- Tc compounds and layered ruthenates.

Original languageEnglish
Pages (from-to)3601-3604
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume324
Issue number21
DOIs
Publication statusPublished - Oct 2012
Externally publishedYes

Keywords

  • Hubbard model
  • Saturated ferromagnetism
  • Spin fluctuation
  • Spiral magnetic structure

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