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MA: Fachverband Magnetismus

MA 19: Poster I

MA 19.5: Poster

Dienstag, 1. April 2014, 13:00–15:30, P1

High-frequency electron paramagnetic resonance studies on heterometal-organic complexes — Changhyun Koo¹, Jaena Park¹, Sebastian Schmidt², Dieter W. Heermann³, Vladislav Kataev⁴, Annie K. Powell^2,5, and •Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, Heidelberg University, Heidelberg, Germany — ²Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany — ³Institute for Theoretical Physics, University of Heidelberg, Heidelberg, Germany — ⁴Leibniz Institute for Solid State and Materials Research IFW Dresden, Dresden, Germany — ⁵Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany

High-frequency electron paramagnetic resonance (HF-EPR) is a powerful tool to investigate in detail spin dynamics and magnetic properties such as g-factor, spin states, anisotropy, and exchange interaction of various materials. The tunable HF-EPR set-up established in Heidelberg covers the frequency range from 8 GHz to 1 THz and allows magnetic fields up to 18 T. Studies on various heterometallic complexes consisting of transition metal and/or lanthanide ions will be presented. One example are 3d-4f heteronuclear clusters, Fe₄Ln₂-comlexes Ln = Tb, Dy, Ho, Y, and Gd. HF-ESR data analyzed in terms of the Ising-spin concept provide estimates of the magnetic coupling between 4f- and 3d-ions.