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MA: Fachverband Magnetismus

MA 6: Molecular Magnetism

MA 6.8: Talk

Monday, March 18, 2024, 11:45–12:00, EB 301

Investigation of magnetic 3d-4f interaction in butterfly-shaped V2Ln2 complexes — •Jan Arneth1, Xianfeng Li2, Jonas Braun2, Annie Powell2, and Rüdiger Klingeler11Kirchhoff Institute for Physics, Heidelberg University, Germany — 2Institute for Nanotechnology, Karlsruhe Institute for Technology, Germany

On the journey to high-performance single molecular magnets (SMM) heterometallic nanoclusters comprising 3d and 4f metal ions are of immense interest for studying the factors that govern the strength and type of intracluster magnetic coupling between the metal ions. Here we investigate the magnetic anisotropy and interactions in a family of butterfly-shaped molecular V2Ln2 (Ln = Y,Tb,Dy,Ho,Er,Tm,Yb) clusters where the V(III) are located on the wingtips and the Ln(III) occupy the body positions. In this series the compounds with Ln = Tb, Dy, Ho and Er show slow relaxation of the magnetisation. Combined magnetic studies and high-field/high-frequency electron paramagnetic resonance (HFEPR) spectroscopy uncover planar anisotropy of the vanadium ion and a weak antiferromagnetic V-V coupling. Furthermore, the data reveal dominant ferromagnetic V-Ln interaction which decreases with increasing number of 4f-electrons.

Keywords: Single Molecular Magnets; High-Field Electron Paramagnetic Resonance

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