Spin fluctuations and ferromagnetic order in two-dimensional itinerant systems with Van Hove singularities

P. A. Igoshev, A. A. Katanin, H. Yamase, V. Yu Irkhin

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The quasistatic approach is used to analyze the criterion of ferromagnetism for two-dimensional (2D) systems with the Fermi level near Van Hove (VH) singularities of the electron spectrum. It is shown that the spectrum of spin excitations (paramagnons) is positively defined when the interaction between electrons and paramagnons, determined by the Hubbard on-site repulsion U, is sufficiently large. Due to incommensurate spin fluctuations near the ferromagnetic quantum phase transition, the critical interaction Uc remains finite at VH filling and exceeds considerably its value obtained from the Stoner criterion. A comparison with the functional renormalization group results and mean-field approximation which yields a phase separation is also performed. Crown

Original languageEnglish
Pages (from-to)899-902
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number7
DOIs
Publication statusPublished - Apr 2009
Externally publishedYes

Keywords

  • Itinerant ferromagnetism
  • Layered magnetic systems
  • Spin-fermion model

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