The Spin-Polarization of the Split Kondo State

Abstract

Spin-resolved scanning tunneling microscopy is employed to quantitatively determine the spin-polarization of the magnetic field-split Kondo state. Tunneling conductance spectra of a Kondo-screened magnetic atom are evaluated within a simple model taking into account inelastic tunneling due to spin excitations and two Kondo peaks positioned symmetrically around the Fermi energy. We fit the spin state of the Kondo-screened atom with a Spin Hamiltonian independent of the Kondo effect and account for Zeeman-splitting of the Kondo peak in the magnetic field. We find that the width and the height of the Kondo peaks scales with the Zeeman energy. Our observations are consistent with full spin-polarization of the Kondo peaks, i.e., a majority spin peak below the Fermi energy and a minority spin peak above.

References in corpus (10)

• The role of magnetic anisotropy in the Kondo effect
• Kondo effect in a magnetic field and the magnetoresistivity of Kondo alloys
• Kondo effect in quantum dots
• Temperature and magnetic field dependence of a Kondo system in the weak coupling regime
• Long-range Kondo signature of a single magnetic impurity
• Splitting of the Kondo resonance in anisotropic magnetic impurities on surfaces
• Ferromagnetic Kondo effect in a triple quantum dot system
• Nonequilibrium Kondo transport through a quantum dot in a magnetic field
• Spin-polarized tunneling microscopy and the Kondo effect
• Spin-Polarized STM for a Kondo adatom

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