Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Quantum Magnets and Molecular Magnets (joint session TT/MA)
TT 6.4: Vortrag
Montag, 12. März 2018, 10:15–10:30, H 3010
Magnetic susceptibility and high frequency EPR studies on three isostructural Fe2IIILn2III complexes — •Silvia Menghi1, Changhyun Koo1, Yan Peng2, Christopher Anson2, Annie Powell2, and Rüdiger Klingeler1 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany — 2Institute of Inorganic Chemistry, Karlsruhe Institut of Technology, Karlsruhe, Germany
Magnetic interactions and anisotropy of three 3d/4f heteronuclear metal-organic complexes are studied by means of high-frequency electron paramagnetic resonance (HF-EPR) and magnetic susceptibility measurements. All complexes under study exhibit isostructural tetranuclear core motifs [(Fe2IIILn2III(µ3-OH)2(teaH)2(O2CCPh)6]·3MeCN (L=Y,Gd,Dy). The HF-EPR data show various resonance branches, each of which with finite zero field splitting. The static magnetic susceptibility data imply strong antiferromagnetic coupling of JFeFe=−6.71(4) cm−1 between the two FeIII centers. The coupling between Fe and Ln was found to be weak and ferromagnetic. In order to gain quantitative insight into the anisotropy and the Fe-Dy exchange interaction, simulations have been performed using a proper hamiltonian which applies a Ising concept for the lanthanide ions.