Disordered Kondo Nanoclusters: Effect of Energy Spacing

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.

arXiv comment4pages 4 figuresDisordered Kondo Nanoclusters: Effect of Energy Spacing

References in corpus (10)

• Disorder-driven non-Fermi liquid behavior in Kondo alloys
• Non-Fermi Liquid Behavior in U and Ce Alloys: Criticality, Disorder, Dissipation, and Griffiths-McCoy singularities
• The Kondo Box: A Magnetic Impurity in an Ultrasmall Metallic Grain
• Giant Magnetic Moments of Nitrogen Stabilized Mn Clusters and Their Relevance to Ferromagnetism in Mn Doped GaN
• Detecting the Kondo screening cloud in conductance measurements on quantum dots
• Band-filling effects on the Kondo-lattice properties
• Localization-induced Griffiths phase of disordered Anderson lattices
• Mesoscopic Kondo screening effect in a single-electron transistor embedded in a metallic ring
• Kondo impurities in nanoscopic systems: new confinement-induced regimes
• Dynamical mean-field study of ferromagnetism in the periodic Anderson model

Cited by in corpus (2)

• Entanglement in Anderson Nanoclusters
• Nonequilibrium Kondo-vs-RKKY Scenarios in Nanoclusters