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VOLUME 41 (1985) | ISSUE 1 | PAGE 18
Concentration phase transition in the Hubbard model
The spin-wave-excitation spectrum in the ferromagnetic Hubbard model is calculated with allowance for Fermi-background vacancies. An increase in the number of vacancies causes the principal ferromagnetic state to become unstable with respect to the spin-wave excitations with a maximum wave vector.