Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Bio- and Molecular Magnetism
MA 14.5: Vortrag
Dienstag, 1. April 2014, 10:30–10:45, HSZ 401
High-field ESR and magnetization studies of a binuclear Ni(II) complex — •Azar Aliabadi1, Karoline Rühlig2, Tobias Rüffer2, Vladislav Kataev1, Heinrich Lang2, and Bernd Büchner1 — 1IFW Dresden, Dresden, Germany — 2Institute of Chemistry, Chemnitz University of Technology, Chemnitz, Germany
We have investigated magnetic properties of a binuclear Ni(II) complex by means of the static magnetization and high-field high-frequency tunable electron spin resonance (HF-ESR). In this compound, two Ni(II) ions each having a spin S=1 are coupled antiferromagnetically which leads to a Stot=0 ground state.
Frequency-dependent HF-ESR spectra yield a g-factor of 2.22. Analysis of the frequency dependence of the ESR signals reveals a positive anisotropy (D>0) corresponding to an easy plane situation and transverse anisotropy for each Ni ion. The calculation of the magnetic field dependence of the spin state energies from the relevant spin Hamiltonian with the experimentally determined set of parameters predicts a change of the ground state from a nonmagnetic singlet state to magnetic ones with increasing the magnetic field due to the level crossings. Such tuning of the ground state by application of a strong magnetic field has been confirmed in the HF-ESR experiments.