Double exchange model for nanoscopic clusters |
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Authors: | David?Rotter Email author" target="_blank">Angelo?ValliEmail author Giorgio?Sangiovanni Karsten?Held |
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Institution: | 1.Institute of Solid State Physics,Vienna University of Technology,Vienna,Austria;2.Institute for Theoretical Physics and Astrophysics,University of Würzburg,Würzburg,Germany |
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Abstract: | 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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