SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: Molecular Magnetism II

MA 24.5: Vortrag

Mittwoch, 29. März 2023, 10:30–10:45, HSZ 02

High-field/high-frequency EPR studies on heterometallic 3d-4f-complexes — •Jan Arneth¹, Changyun Koo¹, Xiangfeng Li², Annie K. Powell², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, Heidelberg University, Germany — ²Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Germany

On the road to the construction of novel efficient single molecular magnets and molecular magnetic refrigerants experimental investigation of the exchange coupling mechanism between 4f and 3d moments is an important, yet still challenging, task. The difficulty in understanding the rich physics underlying this coupling arises from the strong participation of orbital angular momentum leading to large anisotropy and a complex energy spectrum in 4f metal compounds. Here, we present high-field/high-frequency electron paramagnetic resonance (HF-EPR) studies on heterometallic 3d-4f complexes with so-called butterfly motif Fe₂Ln₂ (Ln = Y, Gd, Dy), V₂Ln₂ (Ln = Er, Ho) and in the sawtooth coordination V₄Ln₄ (Ln = La, Gd), which allow us to directly determine not only the exchange coupling constants but also other spin-hamiltonian parameters, such as g-values and anisotropy. Our spectroscopic measurements are further complemented by high-field magnetisation studies.