Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 47: Quantum Magnets, Molecular Magnets and Skyrmions

TT 47.5: Talk

Wednesday, April 3, 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[Mn₂^IIIMo₄^VI(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.