Abstract
The Landau parameter F a 0 in two-dimensional Hubbard model is calculated by the second-order perturbation method. It is shown that F a 0 changes its sign from negative to positive as the filling is increased to the half-filling for the interaction U/ t≳2.0. This means that the spin density waves propagation, zero spin-sound, is possible in the system described by Hubbard model near half-filling. It is shown that the spin susceptibility decreases for U/ t≳2.0 when the half-filling is approached exhibiting the so-called spin-gap behavior.
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