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arXiv 0809.2921cond-mat.str-elcond-mat.mes-hall
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轨道选择近藤效应中共振斜散射增强自旋霍尔效应

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

Guang-Yu Guo, Sadamichi Maekawa, Naoto Nagaosa

摘要:

用第一性原理能带结构计算方法研究了金金属中共振斜散射引起的自旋增强霍尔效应。特别是最近观察到的巨大的自旋霍尔角$γ_S \cong 0.1$(T.Seki等人,Nature Materials { \bf 7},125(2008))归因于Au主体金属中Fe的轨道依赖性近藤效应,其中$t_{2g}$ -轨道在混合价区域中,而$e_g$ -轨道在近藤极限中。$t_{2g}$轨道中的电子关联增强了自旋-轨道相互作用,导致了巨大的自旋霍尔效应。对具有5d轨道的杂质也进行了讨论。

英文摘要:

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 $γ_S \cong 0.1$ 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 $t_{2g}$-orbitals are in the mixed-valence region while $e_g$-orbitals are in the Kondo limit. The enhanced spin-orbit interaction by the electron correlation in the $t_{2g}$-orbitals leads to the gigantic spin Hall effect. Impurities with 5d orbitals are also discussed.

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