期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 324, 期 21, 页码 3601-3604出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2012.02.100
关键词
Hubbard model; Saturated ferromagnetism; Spin fluctuation; Spiral magnetic structure
资金
- Ural Branch of the Russian Academy of Sciences [12-T-2-1001]
- Presidium of RAS
- President Program of Scientific Schools Support [4711.2010.2]
- Max-Planck Society
- Dynasty foundation
- RFBR [11-02-00931-a, 11-02-00937-a]
- Ural Branch of RAS [M-8]
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. (C) 2012 Elsevier B.V. All rights reserved.
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