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The enhanced spin Hall effect in Au metal due to the resonant skew scatteringis studied with first-principles band structure calculations. Especially thegigantic spin Hall angle $\gamma_S \cong 0.1$ observed recently (T.Seki et al.,Nature Materials {\bf 7}, 125 (2008)) is attributed to the orbital-dependentKondo effect of Fe in the Au host metal, where the $t_{2g}$-orbitals are in themixed-valence region while $e_g$-orbitals are in the Kondo limit. The enhancedspin-orbit interaction by the electron correlation in the $t_{2g}$-orbitalsleads to the gigantic spin Hall effect. Impurities with 5d orbitals are alsodiscussed.

Enhanced spin Hall effect by resonant skew scattering in orbital-selective Kondo effect