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VOLUME 52 (1990) | ISSUE 6 | PAGE 949
Instability of Nagaoka state in the approximation of a self-consistent-kinematic field in the limit U→ ∞
It is shown in the approximation of a kinematic field [ E. G. Goryachev and Ε. V. Kuzmin, Phys. Lett. A131,481 (1988) ] that the state of a Nagaoka ferromagnet (R = η = ησ, ησ = 0) is unstable at finite hole densities (pc ~0.2), in agreement with the rigorous assertion of Shastry et al. [ Phys. Rev. В 41,2375 (1990) ].