Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-03-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 revtex pages; V2: Kondo-doublet states description expanded, it is pointed that they are a constructive proof of the KD int
Scientific paper
We analyze the effects of high energy configurations on the Kondo-doublet interaction between two Anderson impurities. We found that the Kondo doublet states are robust and that their coherence energy is incremented by the inclusion of high energy configurations. Analytic expressions are obtained for the corrections near the Kondo limit. Analysis of the system in the intermediate valence regime shows that the behavior of the system can be changed from ferromagnetic to sligthy antiferromagnetic by tuning the system parameters; this regime can also be used to study the interplay between hole-driven and electron-driven coherence effects.
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