Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Organic-Inorganic Hybrid Systems and Organic Films
O 45.16: Poster
Dienstag, 21. März 2017, 18:30–20:30, P1A
Light-induced spin-state switching in Fe(II) spin-crossover thin films on TiTe2 studied with NEXAFS and ARPES — •Simon Jarausch1, Sebastian Rohlf1, Matthias Kalläne1, Benedikt Flöser2, Felix Tuczek2, and Kai Rossnagel1 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24098 Kiel, Germany — 2Institut für Anorganische Chemie, Universität Kiel, 24098 Kiel, Germany
Coordinative Fe(II) complexes are model systems for organic molecules whose electronic, magnetic, and structural properties can be manipulated by external stimuli. Moreover, the temperature- and light-driven spin transitions observed in a number of these materials may provide a suitable testbed for the development of future spintronic devices. The temperature- and light-induced spin-state switching of the spin-crossover complex (SCO) Fe(H2bpz)2(phen) adsorbed on Au(111) is well established, but not preserved for molecules in direct contact to the surface due to molecular dissociation. To avoid this effect, one can either increase the stability of the SCO complex or reduce the substrate-mediated interactions. For the latter approach, the layered transition-metal dichalcogenide TiTe2 may be a promising alternative due to its weak van-der-Waals-like interaction with adsorbates. Here, we present a combined near edge X-ray absorption fine structure (NEXAFS) spectroscopy and angle-resolved photoemission spectroscopy (ARPES) study of the spin-state switching of a stabilized Fe(H2bpz)2(phen) derivative adsorbed on TiTe2.