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Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Bio- and Molecular magnetism

MA 16.7: Vortrag

Dienstag, 17. März 2015, 11:15–11:30, EB 202

Enhanced magnetic interactions in an lanthanide molecular cluster — •Krunoslav Prsa1, J. Nehrkorn1, S. Nekuruh1, W.J. Evans2, J.R. Long3, T. Guidi4, and Oliver Waldmann11Physikalisches Institut Universität Freiburg, Germany — 2Department of Chemistry, University of California, Irvine, USA — 3Department of Chemistry, University of California, Berkeley, USA — 4ISIS Facility, STFC Rutherford Appleton Laboratory, United Kingdom

Technological applications of molecular magnets critically depend on the enhancement of their blocking temperatures. Molecules containing rare-earth ions are promising candidates because of strong anisotropy and large individual magnetic moments. However, the first polynuclear lanthanide clusters suffered from a low interaction strength between the magnetic moments. An N23− radical–bridged dinuclear lanthanide molecular complex, Tb2N23−, was recently synthesized to overcome this problem [1]. Inelastic neutron scattering data on this molecule, its parent compound Tb2N22− as well as the non-magnetic analogue Y2N23−, were recorded at the LET instrument at the ISIS neutron source. In addition to the ligand field levels, we observe excitations due to exchange coupling between the lanthanide magnetic moments which present a direct evidence of enhancement of interactions in this system.

[1] J.D. Rinehart et. al., Nat. Chem. 538-542 (3), 2011.

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