Competition between quantum spin tunneling and Kondo effect

Abstract

Quantum spin tunneling (QST) and Kondo effect are two very different quantum phenomena that produce the same effect on quantized spins, namely, the quenching of their magnetization. However, the nature of this quenching is very different so that QST and Kondo effects compete with each other. Importantly, both QST and Kondo produce very characteristic features in the spectral function that can be measured by means of single spin scanning tunneling spectroscopy that makes it possible to probe the crossover from one regime to the other. We model this crossover, and the resulting changes in transport, using a non-perturbative treatment of a generalized Anderson model including magnetic anisotropy that leads to quantum spin tunneling. We predict that, at zero magnetic field, integer spins can feature a split-Kondo peak driven by quantum spin tunneling.

5 pages, 3 figures; accepted in EPJB; replaced with revised manuscript

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Cited by in corpus (10)

• Observation of fractional edge excitations in nanographene spin chains
• Spin decoherence of magnetic atoms on surfaces
• Probing Magnetic Excitations and Correlations in Single and Coupled Spin Systems with Scanning Tunneling Spectroscopy
• Exchange mechanism for electron paramagnetic resonance of individual adatoms
• Electrically addressing the spin of a magnetic porphyrin through covalently connected graphene electrodes
• Renormalization of spin excitations and Kondo effect in open shell nanographenes
• Spin dependent transmission of Nickelocene-Cu contacts probed with shot noise
• Renormalization of single-ion magnetic anisotropy in the absence of Kondo effect
• Probing local moments in nanographenes with electron tunneling spectroscopy
• Simulation of inelastic spin flip excitations and Kondo effect in STM spectroscopy of magnetic molecules on metal substrates