Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Bio- and Molecular Magnetism
MA 20.4: Vortrag
Dienstag, 21. März 2017, 10:15–10:30, HSZ 301
High-frequency EPR study on the 3d-4f heterometallic single crystal DyNi2 — •Changhyun Koo1, Msia Tavhelidse1, Michael Grosshauser2, Dennis Müller2, Peter Comba2, and Rüdiger Klingeler1,3 — 1Kirchhoff Institute of Physics, Heidelberg University, Germany. — 2Institute of Inorganic Chemistry, Heidelberg University, Germany. — 3Center for Advanced Materials, Heidelberg University, Germany.
3d-4f heterometallic complexes provide a potential route to highly anisotropic single molecular magnets with high magnetic moments. Here, we report on the static and dynanmic magnetic properties of a heterometallic [DyIII(NiII(Ltacn))2]ClO4 (i.e., DyNi2) single crystal. The spin ground state is derived from the static magnetisation data. Due to misaligned magnetic axes of the magnetic ions and twisted misaligned two molecules in the unit cell, our high-frequency electron paramagnetic resonance (HF-EPR) spectra exhibit non-equally separated resonance features including a forbidden transition in a resonance frequency-magnetic field diagram. From the temperature dependence of the resonances, the ground state transitions and the excited state transitions are sorted out. The comparison of experimental data with simulations by means of matrix diagonalization of an appropriate spin Hamiltonian including an Ising concept for the Dy ion allows reasonably estimating the relevant parameters, i.e. D, E, of the Ni ions, and JDy−Ni in the DyNi2 complex.