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arXiv · 1408.4037

Kondo versus indirect exchange: the role of the lattice and the actual range of RKKY interactions in real materials

Andrew Allerdt·C. A. Busser·G. B. Martins·A. E. Feiguin
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Abstract

Magnetic impurities embedded in a metal interact via an effective Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling mediated by the conduction electrons, which is commonly assumed to be long ranged, with an algebraic decay in the inter-impurity distance. However, they can also form a Kondo screened state that is oblivious to the presence of other impurities. The competition between these effects leads to a critical distance above which Kondo effect dominates, translating into a finite range for the RKKY interaction. We study this mechanism on the square and cubic lattices by introducing an exact mapping onto an effective one-dimensional problem that we can solve with the density matrix renormalization group method (DMRG). We show a clear departure from the conventional RKKY theory, that can be attributed to the dimensionality and different densities of states. In particular, for dimension d>1, Kondo physics dominates even at short distances, while the ferromagnetic RKKY state is energetically unfavorable.

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Andrew Allerdt, C. A. Busser, G. B. Martins, A. E. Feiguin. 2014-08-18. Kondo versus indirect exchange: the role of the lattice and the actual range of RKKY interactions in real materials. https://doi.org/10.1103/physrevb.91.085101

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