Journal
EUROPEAN PHYSICAL JOURNAL B
Volume 86, Issue 2, Pages -Publisher
SPRINGER
DOI: 10.1140/epjb/e2012-30829-y
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Funding
- Austrian Science Fund (FWF) through the Austria-Russia joint Project [I610]
- DFG research unit [FOR1346]
- Austrian Bundesministerium fur Wissenschaft und Forschung
- European Union within the EU-Indian network MONAMI
- Austrian Science Fund (FWF) [I 610] Funding Source: researchfish
- Austrian Science Fund (FWF) [I610] Funding Source: Austrian Science Fund (FWF)
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We solve the double exchange model on nanoscopic clusters exactly, and specifically consider a six-site benzene-like nanocluster. This simple model is an ideal testbed for studying magnetism in nanoclusters and for validating approximations such as the dynamical mean field theory (DMFT). Non-local correlations arise between neighboring localized spins due to the Hund's rule coupling, favoring a short-range magnetic order of ferro or antiferromagnetic type. For a geometry with more neighboring sites or a sufficiently strong hybridization between leads and the nanocluster, these non-local correlations are less relevant, and DMFT can be applied reliably.
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