Spin Wave Instability of Itinerant Ferromagnet

Details Spin Wave Instability of Itinerant Ferromagnet Spin Wave Instability of Itinerant Ferromagnet

1997-07-29

arxiv.org/abs/cond-mat/9707300v1

Physics

Condensed Matter

11 pages, 8 figures

Scientific paper

10.1103/PhysRevB.57.403

We show variationally that instability of the ferromagnetic state in the Hubbard model is largely controlled by softening of a long-wavelength spin-wave excitation, except in the over-doped strong-coupling region where the individual-particle excitation becomes unstable first. A similar conclusion is drawn also for the double exchange ferromagnet. Generally the spin-wave instability may be regarded as a precursor of the metal-insulator transition.

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