Disordered Kondo Nanoclusters: Effect of Energy Spacing

Details Disordered Kondo Nanoclusters: Effect of Energy Spacing Disordered Kondo Nanoclusters: Effect of Energy Spacing

2003-07-19

arxiv.org/abs/cond-mat/0307486v1

Physics

Condensed Matter

Strongly Correlated Electrons

4pages 4 figuresDisordered Kondo Nanoclusters: Effect of Energy Spacing

Scientific paper

10.1103/PhysRevB.70.132404

Exact diagonalization results for Kondo nanoclusters alloyed with mixed valence impurities show that tuning the {\it energy spacing}, $\Delta$, drives the system from the Kondo to the RKKY regime. The interplay of $\Delta$ and disorder gives rise to a $\Delta$ versus concentration T=0 phase diagram very rich in structure, where regions with prevailing Kondo or RKKY correlations alternate with domains of ferromagnetic order. The local Kondo temperatures, $T_K$, and RKKY interactions depend strongly on the local environment and are overall {\it enhanced} by disorder, in contrast to the hypothesis of ``Kondo disorder'' single-impurity models.

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