Fully compensated Kondo effect for a two-channel spin S=1 impurity

Abstract

We study the low-temperature properties of the generalized Anderson impurity model in which two localized configurations, one with two doublets and the other with a triplet, are mixed by two degenerate conduction channels. By using the numerical renormalization group and the non-crossing approximation, we analyze the impurity entropy, its spectral density, and the equilibrium conductance for several values of the model parameters. Marked differences with respect to the conventional one-channel spin $s=1/2$ Anderson model, that can be traced as hallmarks of an impurity spin $S=1$, are found in the Kondo temperature, the width and position of the charge transfer peak, as well as the temperature dependence of the equilibrium conductance. Furthermore, we analyze the rich effects of a single-ion magnetic anisotropy $D$ on the Kondo behavior. In particular, as shown before, for large enough positive $D$ the system behaves as a "non-Landau" Fermi liquid that cannot be adiabatically connected to a non-interacting system turning off the interactions. For negative $D$ the Kondo effect is strongly suppressed. The model studied is suitable for a comprehensive analysis for recent investigations of a single Ni impurity embedded into an Au chain.

15 pages, 14 figures

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Cited by in corpus (9)

• Spin dependent transmission of Nickelocene-Cu contacts probed with shot noise
• Iron phthalocyanine on Au(111) is a "non-Landau" Fermi liquid
• Kondo effect in electrostatically defined ZnO quantum dots
• Low-energy physics for an iron phthalocyanine molecule on Au(111)
• Topological quantum phase transition in individual Fe Atoms on MoS${}_2$/Au(111)
• Anisotropic Kondo screening induced by spin-orbit coupling in quantum wires
• The PointGroupNRG code for numerical renormalization group calculations with discrete point-group symmetries
• Unraveling screening mechanisms in Kondo impurities using an NRG-MPS-based method
• Phases and phase transitions of an $S=3/2$ chain on metallic and semi-metallic surfaces