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XMCD study of the magnetic exchange coupling in a fluoride-bridged Dy-Cr molecular cluster

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Abstract

We have studied the fluoride-bridged Dy-Cr molecular nanomagnet [Dy(hfac)4-CrF2(py)4]·1/2CHCl3 by x-ray magnetic circular dichroism (XMCD). The obtained element-specific magnetization curves allow for a quantification of the sign and strength of the magnetic exchange coupling between the Dy and the Cr ions. In an effective spin-1/2 formalism only taking into account the ground Kramers doublet of the DyIII ion, we find a coupling strength of j eff,z = −2.3(1) cm−1. Further, we find that the ground Kramers doublet is nearly perfectly axial with g eff,z ,Dy = 19.6(6) and g eff,xy ,Dy = 0(2). The coupling value corresponds to a “true”, non-effective isotropic coupling of j = −0.16 cm−1 when taking into account a full J = 15/2 angular momentum. This coupling strength is comparable to that of j = −0.18 cm−1 previously found in the related fluoride-bridged compound Dy-Cr-Dy.

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Authors and Affiliations

  1. Swiss Light Source, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland

    Jan Dreiser, Cinthia Piamonteze & Frithjof Nolting

  2. Department of Chemistry, University of Copenhagen, DK-2100, Copenhagen, Denmark

    Kasper S. Pedersen & Jesper Bendix

  3. Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland

    Stefano Rusponi & Harald Brune

Authors
  1. Jan Dreiser
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  2. Cinthia Piamonteze
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  3. Frithjof Nolting
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  4. Kasper S. Pedersen
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  5. Jesper Bendix
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  6. Stefano Rusponi
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  7. Harald Brune
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Correspondence to Jan Dreiser.

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Dreiser, J., Piamonteze, C., Nolting, F. et al. XMCD study of the magnetic exchange coupling in a fluoride-bridged Dy-Cr molecular cluster. Journal of the Korean Physical Society 62, 1368–1371 (2013). https://doi.org/10.3938/jkps.62.1368

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  • DOI: https://doi.org/10.3938/jkps.62.1368

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