PSEUDOGAP VALUE IN THE ENERGY SPECTRUM OF LaOFeAs: A FIXED SPIN MOMENT TREATMENT
Korotin M.A., Streltsov S.V., Shorikov A.O., Anisimov V.I.

Received: May 23, 2008

PACS: 71.15.Mb, 74.25.Jb

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The experimental data currently available in the literature on the paramagnetic-spin density wave transition in nonsuperconducting LaOFeAs are discussed. In particular, we note that a relative decrease in the density of states on the Fermi level and a pseudogap formation occur upon a spin density wave transition. The values of these quantities are not properly described in the framework of the density functional theory. The agreement with experimental estimations becomes more accurate with the use of a fixed spin moment procedure when the iron spin moment is set to the experimental value. Strong electron correlations that are not included into the present calculation scheme may lead both to a decrease in the spin moment and to a renormalization of the energy spectrum in the vicinity of the Fermi level for correct description of the discussed characteristics.