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Phys. Rev. Lett. 102, 036401 (2009) [4 pages]

Enhanced Spin Hall Effect by Resonant Skew Scattering in the Orbital-Dependent Kondo Effect

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Guang-Yu Guo1, Sadamichi Maekawa2,3, and Naoto Nagaosa4,5,*
1Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 106, Taiwan
2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
3CREST, Japan Science and Technology Agency, Tokyo 100-0075, Japan
4Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
5Cross-Correlated Materials Research Group (CMRG), ASI, RIKEN, Wako 351-0198, Japan

Received 17 September 2008; published 20 January 2009

See accompanying Physics Viewpoint

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 γS≅0.1 observed recently [ T. Seki et al. Nature Mater. 7 125 (2008)] is attributed to the orbital-dependent Kondo effect of Fe in the Au host metal, where the t2g orbitals are in the mixed-valence region while eg orbitals are in the Kondo limit. The enhanced spin-orbit interaction by the electron correlation in the t2g orbitals leads to the gigantic spin Hall effect. Impurities with 5d orbitals are also discussed.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.036401
DOI:
10.1103/PhysRevLett.102.036401
PACS:
71.70.Ej, 75.30.Kz, 75.80.+q, 77.80.−e

*nagaosa@appi.t.u-tokyo.ac.jp

 
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