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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.32: Poster

Thursday, March 19, 2020, 15:00–18:00, P3

Light-, temperature-, and x-ray-induced spin-crossover transition of molecules adsorbed on a graphite surface — •Jorge Torres1, Lalminthang Kipgen1, Sascha Ossinger2, Sangeeta Thakur1, Ivar Kumberg1, Rahil Hosseinifar1, Lucas M. Arruda1, Evangelos Golias1, Chen Luo3, Kai Chen3, Florin Radu3, Felix Tuczek2, and Wolfgang Kuch11Freie Universität Berlin, Institut für Experimentalphysik, Berlin, Germany — 2Christian-Albrechts-Universität zu Kiel, Institut für Anorganische Chemie, Kiel, Germany — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany

The octahedral symmetry of the metal-ligand bonds of spin-crossover (SCO) molecules enables them to switch between high-spin (HS) and low-spin (LS) electronic configurations when exposed to light or temperature change. The cooperativity between SCO molecules can be studied from bottom-up growth of submonolayer coverages on well-defined substrates by X-ray absorption spectroscopy (XAS). A 0.4 monolayer coverage of [Fe(H2B(pypz)(pz))2] was deposited on highly oriented pyrolytic graphite and measured by XAS. Analysis of the HS to LS fraction showed that light-induced excited spin-state trapping at 10 K doubles the high-spin fraction compared with the value reached by thermally induced spin-state transition at room temperature. On the other hand, due to the onset of soft-x-ray-induced excited spin-state trapping, the largest amount of LS-state molecules is reached at 60 K, while the transition temperature T1/2 (50% HS and 50% LS) is at 300 K.

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