Direct evidence for suppression of the Kondo effect due to pure spin current

2016/03/29 by Kohei Hamaya, K. Hamaya, T. Kurokawa +8
Physics and Astronomy · #Alloy #Atomic physics #Condensed matter physics #Diffusion #Electrical resistivity and conductivity #Electron #Excited state #Fermi level #Ferromagnetism #Kondo effect #Kondo insulator #Magnetic properties of thin films #Materials science #Metallurgy #Physics #Plateau (mathematics) #Quantum and electron transport phenomena #Quantum mechanics #Rare-earth and actinide compounds #Singlet state #Spin (aerodynamics) #Spin diffusion #Thermodynamics #cond-mat.mes-hall #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevb.94.140401

published as Phys. Rev. B 94, 140401(R) (2016) · 5 pages, 4 figures

arxiv created 2016/03/29 · openalex publication_date 2016/10/04 · arxiv updated 2016/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study the effect of a pure spin current on the Kondo singlet in a diluted magnetic alloy using nonlocal lateral spin valve structures with highly spin polarized Co₂FeSi electrodes. Temperature dependence of the nonlocal spin signals shows a sharp reduction with decreasing temperature, followed by a plateau corresponding to the low temperature Fermi liquid regime below the Kondo temperature (T_K). The spin diffusion length of the Kondo alloy is found to increase with increasing spin accumulation. The results are in agreement with the intuitive description that the Kondo singlet cannot survive any more in sufficiently large spin accumulation even below T_K.

Citations

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