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Disordered Kondo Nanoclusters: Effect of Energy Spacing

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arxiv cond-mat/0307486 v1 pith:F4T3PY4B submitted 2003-07-19 cond-mat.str-el

classification cond-mat.str-el
keywords kondodeltadisorderrkkyenergylocalnanoclustersspacing
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abstract

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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