Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 68: Poster 5
MA 68.2: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG4
High-frequency EPR studies on lanthanide monomers in different ligand structures — •Julian Butscher1, Changhyun Koo1, Johannes Werner1, Asha Roberts2, Peter Comba2, and Rüdiger Klingeler1 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany — 2Anorganisch-Chemisches Institut, Universität Heidelberg, Heidelberg, Germany
4f-lanthanide single molecular magnets (SMMs) find increasing interest in the SMM research field due to their high magnetic anisotropy caused by strong spin-orbit coupling in Ln ions. We report the magnetic properties of Ln monomers (Ln = Dy(III) and Tb(III)) in different ligand structures ([Dy(III)(2Li-1,2-HOPo)2]pyH, [Tb(III)(2Li-1,2-HOPO)2]PyH, and [Tb(III)(5Li-1,2-HOPO)2]PyH) which are studied by means of high-field magnetometry and high-frequency electron paramagnetic resonance (HF-EPR). The HF-EPR spectra of all complexes, at T = 2 K, exhibit only a single resonance feature which frequency linearly increases with the external magnetic field. The associated g-factors much larger than 2 are read-off the frequency vs. magnetic field diagrams. Finite zero-field splitting (ZFS) is observed in the [Tb(III)(2Li-1,2-HOPO)2]PyH-complex which indicates lifting of the degeneracy in a non-Kramers doublet. The ground states of the complexes are estimated by using high-field magnetization and HF-EPR measurements, as well as by energy level calculations.