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First-principles dynamical CPA (Coherent-Potential Approximation) forelectron correlations has been developed further by taking into accounthigher-order dynamical corrections with use of the asymptotic approximation.The theory is applied to the investigations of a systematic change ofexcitation spectra in $3d$ transition metals from Sc to Cu at finitetemperatures. It is shown that the dynamical effects damp main peaks in thedensities of states (DOS) obtained by the local density approximation to thedensity functional theory, reduce the band broadening due to thermal spinfluctuations, create the Mott-Hubbard type bands in the case of fcc Mn and fccFe, and create a small hump corresponding to the `6 eV' satellite in the caseof Co, Ni, and Cu. Calculated DOS explain the X-ray photoelectron spectroscopydata as well as the bremsstrahlung isochromat spectroscopy data. Moreover, itis found that screening effects on the exchange energy parameters aresignificant for understanding the spectra in magnetic transition metals.

Dynamical coherent-potential approximation approach to excitation spectra in 3d transition metals