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arXiv · 0911.2148

Kondo screening in high-spin side-coupled two-impurity clusters

Rok Zitko
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Abstract

We study the system of two magnetic impurities described by a two-impurity Kondo model where only the first impurity couples directly to the conduction band, while the second impurity interacts with the first through Heisenberg exchange coupling in a "side-coupled" configuration. We consider various choices of the impurity spins (S_1 S_2) and we contrast the regimes where the inter-impurity exchange coupling J is either lower or higher than the Kondo temperature T_K^(0) of the first impurity in the absence of the second. This model is a high-spin generalization of the two-impurity model for side-coupled double quantum dots which corresponds to the simplest S_1=S_2=1/2 case, where the moments are Kondo screened successively in two stages for J = S_1. For S_1 >= 1, the second Kondo temperature T_K^(2) is not exponentially reduced, as for S_1 = 1/2, but is approximately a power-law function of the coupling J. Furthermore, for S_1 >=1 1 all three scales (T_K^(0), J, T_K^(2)) explicitly appear in the temperature-dependence of the thermodynamic properties. For S_1 > S_2, there is no second stage of screening for J T_K^(0) the Kondo screening of the effective spin S_1-S_2 is found.

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Rok Zitko. 2009-11-11. Kondo screening in high-spin side-coupled two-impurity clusters. https://doi.org/10.1088/0953-8984%2F22%2F2%2F026002

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