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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.34: Poster

Freitag, 1. Oktober 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 Ruben^4,5, Uwe Bovensiepen¹, Peter Kratzer¹, Marika Schleberger¹, and Heiko Wende¹ — ¹Faculty 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 (T_1/2↑=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).