Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.18: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster B
ARPES study of the electronic structure and light-induced spin-state switching in Fe(II) spin-crossover films on Au(111) — •Sebastian Rohlf1, Eric Ludwig1, Holger Naggert2, Matthias Kalläne1, Erik Kröger1, Alexander Bannwarth2, Arndt Quer1, Kai Rossnagel1, Lutz Kipp1, and Felix Tuczek2 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel — 2Institut für Anorganische Chemie, Universität Kiel, D-24098 Kiel
Coordinative Fe(II) complexes are model systems for organic molecules whose optical, electronic, and magnetic properties can be manipulated by external stimuli. Moreover, the temperature- and irradiation- dependent spin transitions observed in a number of these materials may provide a suitable testbed toward the development of future spintronic devices. Here, we present an angle-resolved photoelectron spectroscopy (ARPES) study of thin films of the spin-crossover complex Fe(H2bpz)2(phen) adsorbed on Au(111) [1]. The photoemission results provide detailed insight into the connection between spin transitions and the valence electronic structure at different temperatures and varying irradiation conditions. In particular, evidence is found for a VUV-induced spin-state trapping effect at low temperatures. Furthermore, the results show that a high optical photon flux can stabilize the metastable high-spin state far above the LIESST transition temperature, allowing us to determine the relaxation rates after photoexcitation as a function of temperature.
[1] E. Ludwig et al., Angew. Chem. Int. Ed. 53, 3019 (2014).