paper

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

arXiv:0809.2921 · doi:10.1103/PhysRevLett.102.036401

Abstract

The enhanced spin Hall effect in Au metal due to the resonant skew scattering is studied with first-principles band structure calculations. Especially the gigantic spin Hall angle observed recently (T.Seki et al., Nature Materials {\bf 7}, 125 (2008)) is attributed to the orbital-dependent Kondo effect of Fe in the Au host metal, where the -orbitals are in the mixed-valence region while -orbitals are in the Kondo limit. The enhanced spin-orbit interaction by the electron correlation in the -orbitals leads to the gigantic spin Hall effect. Impurities with 5d orbitals are also discussed.

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