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      Influence of antisymmetric exchange interaction on quantum tunneling of magnetization in a dimeric molecular magnet Mn6

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          Abstract

          We present magnetization measurements on the single molecule magnet Mn6, revealing various tunnel transitions inconsistent with a giant-spin description. We propose a dimeric model of the molecule with two coupled spins S=6, which involves crystal-field anisotropy, symmetric Heisenberg exchange interaction, and antisymmetric Dzyaloshinskii-Moriya exchange interaction. We show that this simplified model of the molecule explains the experimentally observed tunnel transitions and that the antisymmetric exchange interaction between the spins gives rise to tunneling processes between spin states belonging to different spin multiplets.

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          Author and article information

          Journal
          03 October 2008
          Article
          10.1103/PhysRevB.78.132401
          0810.0616
          f694e899-b119-4984-97d3-f9c87c8d2cc1

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          Phys. Rev. B 78, 132401 (2008)
          5 pages, 4 figures
          cond-mat.mes-hall cond-mat.mtrl-sci

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