Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.63: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
high frequency EPR studies on lanthanide monomers in different ligand structures — •sajedeh shahbazi1, johannes werner1, julian butscher1, changhyun koo1, asha roberts2, peter comba2, denis gorbunov3, and rüdiger klingeler1 — 1Kirshhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany — 2Anorganisch-Chemisches Institut, Universität Heidelberg, Heidelberg, Germany — 3Hochfeld-Magnetlabor Dresden, Institution Helmholtz-Zentrum, Dresden, Germany
The magnetic properties of lanthanide monomers (Ln=Dy(III) and Tb(III)) in two different ligand structures but similar coordination geometries ([Ln(x-1,2-HOPO)2]PyH (x = 2Li,5Li)) are reported in order to investigate ligand field effects. The ground states of the complexes were estimated by using high-field electron paramagnetic resonance (HF-EPR) and pulsed-field magnetization studies. The slopes of the resonance branches seen in the HF-EPR data on the Tb-complexes correspond to g-factors much larger than 2 implying a forbidden transition. Based on the HF-EPR data and the saturated magnetization value at B=58 T, the ground states of the Tb-complexes are derived. Finite zero-field splitting observed in [Tb(III)(2Li-1,2-HOPO)2]PyH indicates lifting of the degeneracy in a non-Kramers doublet. From the obtained experimental results, the ligand field effect on the ground state in the studied complexes is discussed.