Abstract
The self-consistent second-order perturbation theory is applied to a realistic multiband Hubbard model of bcc iron with realistic local Coulomb interaction terms, and both the single-electron Green's function and the dynamical transverse susceptibility are calculated while preserving the spin rotational symmetry. The overall bandwidth reduction is obtained and is in agreement with experiments and previous theoretical results, but no significant additional mass enhancement near the Fermi surface is found. The spin wave mode is found to evolve in the dynamical spin fluctuation spectrum, whose frequency vanishes correctly in the long wavelength limit. The spin stiffness constant \(D\) is found to be in good agreement with other theoretical results and is smaller than the experimental value.
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