Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Molecular Magnetism

MA 6.8: Vortrag

Montag, 18. März 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 Klingeler¹ — ¹Kirchhoff 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