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 Waldmann¹ — ¹Physikalisches 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.