Abstract
Within the framework of strongly correlated Hubbard model the Green function of transverse spin components is derived. In the first nonvanishing approximation with respect to the inverse effective radius of interaction all contributions to the self-energy were determined. The spectrum and damping of elementary excitations is analyzed for the ferromagnetic phase. At the temperature T=0 and hole concentration c⪡1 the spin-wave stiffness constant D includes additional term which is proportional to c 4/3. It differs from the result D∼ c when the effective “dressing” of the interaction line is neglected. In order to find the temperature dependence of the susceptibility, self-consistent equations for mean spin and chemical potential have been solved numerically. The results for the temperature dependence of the magnetization are consistent with experimental values.
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