Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 41: Poster III

MA 41.25: Poster

Thursday, March 20, 2025, 15:00–17:30, P3

Probing the magnetic anisotropy in mononuclear 4f- and 5f-complexes by high-field/high-frequency EPR — •J. Arneth, B. Beier, and R. Klingeler — Kirchhoff Institute for Physics, Heidelberg University, Germany

The quantitative experimental investigation of magnetic anisotropy in 4f- and 5f-compounds remains a challenging task as strong spin-orbit coupling and ligand field effects lead to complex electronic structures while magnetisation measurements often provide only scarce information. Here, we report high-frequency/high-field electron paramagnetic resonance spectroscopy (HF-EPR) studies on mononuclear Er(III) [1,2], U(IV) and U(V) [3] molecular complexes, the former in various ligand coordinations. Our experimental data allow for the direct determination of zero field splittings (ZFS) and effective g-factors of the magnetic ground state and the low-energy excited states. The effect of the ligand fields as well as its relevance for the static and dynamic magnetic properties are discussed.
[1] Arneth et al., submitted
[2] Bazhenova et al., Molecules 26, 6908 (2021)
[3] Lichtenberger et al., J. Am. Chem. Soc. 138, 9033 (2016)

Keywords: High-Field Electron Paramagnetic Resonance; Molecular Magnets; Magnetic Anisotropy; Lanthanides; Actinides