Exact diagonalization results for Kondo nanoclusters alloyed with mixed
valence impurities show that tuning the {\it energy spacing}, Δ, drives
the system from the Kondo to the RKKY regime. The interplay of Δ and
disorder gives rise to a Δ 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,
TK​, 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.Comment: 4pages 4 figuresDisordered Kondo Nanoclusters: Effect of Energy
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