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Double exchange model for nanoscopic clusters

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Listed:
  • David Rotter
  • Angelo Valli
  • Giorgio Sangiovanni
  • Karsten Held

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. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Suggested Citation

  • David Rotter & Angelo Valli & Giorgio Sangiovanni & Karsten Held, 2013. "Double exchange model for nanoscopic clusters," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 86(2), pages 1-8, February.
  • Handle: RePEc:spr:eurphb:v:86:y:2013:i:2:p:1-8:10.1140/epjb/e2012-30829-y
    DOI: 10.1140/epjb/e2012-30829-y
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    Keywords

    Mesoscopic and Nanoscale Systems;

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