Renormalization of single-ion magnetic anisotropy in the absence of Kondo effect

Abstract

Inelastic spin flip excitations associated with single-ion magnetic anisotropy of quantum spins, can be strongly renormalized by Kondo exchange coupling to the conduction electrons in the substrate, as shown recently for the case of Co adatoms on CuN${}_2$ islands. In this case differential conductance spectra show zero-bias anomalies due to a Kondo effect of the doubly degenerate ground state, and finite-bias step features due to spin flip excitations. Here I consider spin-1 quantum magnets with positive uniaxial anisotropy, where the ground state is non-degenerate and hence the Kondo effect does not take place. Nevertheless the renormalization of inelastic spin excitations due to exchange coupling by hybridization of the quantum spin with the conduction electrons still takes place despite the complete absence of the Kondo effect in the ground state. Additionally, I show that away from particle-hole symmetry, charge fluctuations have a similar effect to Kondo exchange coupling, leading to the renormalization of spin flip excitations. However, in contrast to the renormalization by Kondo exchange, charge fluctuations lead to asymmetric spectra, which for strong charge fluctuations can mimic Fano behavior.

Replaced with revised version published in Phys. Rev. B; 9 pages, 7 figures

References in corpus (9)

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• Tuning the Kondo effect with a mechanically controllable break junction
• The Kondo effect in ferromagnetic atomic contacts
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• Properties of anisotropic magnetic impurities on surfaces
• Orbital-selective spin excitation of a magnetic porphyrin
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Cited by in corpus (10)

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• Moiré tuning of spin excitations: Individual Fe atoms on MoS${}_2$/Au(111)
• Extending the spin excitation lifetime of a magnetic molecule on a proximitized superconductor
• Simulation of inelastic spin flip excitations and Kondo effect in STM spectroscopy of magnetic molecules on metal substrates
• Dynamical Screening of Local Spin Moments at Metal-Molecule Interfaces
• Spin Excitations of High Spin Iron(II) in Metal-Organic Chains on Metal and Superconductor
• Manipulation of the magnetic state of a porphyrin-based molecule on gold: From Kondo to quantum nanomagnet via the charge fluctuation regime