Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Quantum Magnets, Molecular Magnets and Skyrmions
TT 47.5: Vortrag
Mittwoch, 3. April 2019, 16:00–16:15, H23
Anisotropy in Mn2- and Co-complexes studied by high-frequency EPR spectroscopy — •Lena Spillecke1, Changhyun Koo1, Sajedeh Shahbazi1, Marcel Patrick Merkel2, Sebastian Schmidt2, Annie K. Powell2, and Rüdiger Klingeler1 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany — 2Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany
We present high-frequency/high-field electron paramagnetic resonance (HF-EPR) and static magnetisation studies on a Mn-([TBA]2[Mn2IIIMo4VI(µ2-O)6(Ot)8(HTea)2]) and a Co-Cl2 metal-organic coordination complex. Magnetic susceptibility of the Mn2-complex indicates weak ferromagnetic exchange interaction between the octahedrally coordinated Mn3+ ions, S=2. A strong anisotropy is suggested by a zero-field splitting (ZFS) of about Δ =300 GHz observed in HF-EPR data. For the Co-monomer, our data imply high-spin Co2+ which is presumingly antiferromagnetically coupled to a radical in the ligand-shell, hence forming an S=1 ground state. Based on the measured ZFS and g-factor as well as the temperature dependence of the linewidth, the potential of the Co-complex as single molecular magnets is discussed.