Enhancement of Spin-Charge Conversion in Dilute Magnetic Alloys by Kondo Screening

Chunli Huang, Ilya V. Tokatly, Miguel A. Cazalilla

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We derive a kinetic theory capable of dealing both with large spin-orbit coupling and Kondo screening in dilute magnetic alloys. We obtain the collision integral nonperturbatively and uncover a contribution proportional to the momentum derivative of the impurity scattering matrix. The latter yields an important correction to the spin diffusion and spin-charge conversion coefficients, and fully captures the so-called side-jump process without resorting to the Born approximation (which fails for resonant scattering), or to otherwise heuristic derivations. We apply our kinetic theory to a quantum impurity model with strong spin-orbit, which captures the most important features of Kondo-screened Cerium impurities in alloys such as . We find (1) a large zero-temperature spin-Hall conductivity that depends solely on the Fermi wave number and (2) a transverse spin diffusion mechanism that modifies the standard Fick’s diffusion law. Our predictions can be readily verified by standard spin-transport measurements in metal alloys with Kondo impurities.

Original languageEnglish
Article number176801
JournalPhysical Review Letters
Volume127
Issue number17
DOIs
StatePublished - Oct 22 2021

Bibliographical note

Publisher Copyright:
© 2021 American Physical Society

ASJC Scopus subject areas

  • General Physics and Astronomy

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