Disordered Kondo Nanoclusters: Effect of Energy Spacing
C. Verdozzi, Y. Luo, Nicholas Kioussis
Abstract
Exact diagonalization results for Kondo nanoclusters alloyed with mixed valence impurities show that tuning the 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 enhanced by disorder, in contrast to the hypothesis of ``Kondo disorder'' single-impurity models.
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