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SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.34: Poster

Friday, October 1, 2021, 10:00–13:00, P

Spectroscopic studies of a Fe(II) spin-crossover complex in the room temperature regime — •Lea Spieker1, Stephan Sleziona1, Gérald Kämmerer1, Carolin Schmitz-Antoniak2, Torsten Kachel3, Soma Salamon1, Damian Günzing1, Tobias Lojewski1, Nico Rothenbach1, Andrea Eschenlohr1, Katharina Ollefs1, Senthil Kumar Kuppusamy4, Mario Ruben4,5, Uwe Bovensiepen1, Peter Kratzer1, Marika Schleberger1, and Heiko Wende11Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen — 2Jülich Research Center — 3Helmholtz Center Berlin — 4Karlsruhe Institute of Technology — 5CNRS-University of Strasbourg

Spin-crossover complexes with a bi-stable spin-state switching in the room temperature regime, influenced by external stimuli such as light, pressure, temperature, or X-rays, are desirable for applications. With different spectroscopic methods, like Raman- and X-ray absorption spectroscopy, we investigated a Fe(II) complex showing a phase transition from a diamagnetic low-spin (S=0) to a paramagnetic high-spin (S=2) state in the room temperature regime (T1/2↑=330 K) with a broad thermal hysteresis of Δ T = 50 K. Unique changes of the molecular bondings during a temperature-induced phase transition are confirmed by Raman spectroscopy measurements combined with density functional theory calculations. In addition, X-ray absorption spectroscopy measurements reveal a thermally reversible soft X-ray induced excited spin-state trapping effect in the room temperature regime. Financially supported by CRC 1242 Project A05 (Project-ID 278162697).

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