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Critical spin fluctuation mechanism for the spin Hall effect

ORAL

Abstract

We propose mechanisms for the spin Hall effect in metallic systems arising from the coupling between conduction electrons and local magnetic moments that are dynamically fluctuating. We consider a microscopic model proposed by Kondo [1] for the coupling between electrons and local moments and describe the fluctuation of local moments using the self-consistent renormalization method by Moriya [2]. Both a side-jump-type mechanism and a skew-scattering-type mechanism naturally arise and give rise to a nontrivial temperature dependence in the spin Hall conductivity. This leads to the enhancement in the spin Hall conductivity at non-zero temperatures near the ferromagnetic instability [3]. The proposed mechanisms could be observed in 4d or 5d metallic compounds.
[1] J. Kondo, Prog. Theor. Phys.27, 772 (1962).
[2] T. Moriya, Spin Fluctuations in Itinerant Electron Magnetism, Solid-State Sciences 56 (Springer-Verlag, 1985).
[3] S. Okamoto, T. Egami, and N. Nagaosa, arXiv:1905.10929 (to be published).

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Presenters

  • Satoshi Okamoto

    Oak Ridge National Lab, Materials Science and Technology Division, Oak Ridge National Laboratory, University of Tennessee, Knoxville, Oak Ridge National Laboratory

Authors

  • Satoshi Okamoto

    Oak Ridge National Lab, Materials Science and Technology Division, Oak Ridge National Laboratory, University of Tennessee, Knoxville, Oak Ridge National Laboratory

  • Takeshi Egami

    Department of Materials Science and Engineering, University of Tennessee, Oak Ridge National Lab, University of Tennessee, Knoxville

  • Naoto Nagaosa

    Department of Applied Physics, University of Tokyo, CEMS, RIKEN, Department of Applied Physics, The University of Tokyo, Univ of Tokyo, RIKEN CEMS, University of Tokyo, RIKEN CEMS, RIKEN & University of Tokyo