Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.4: Vortrag
Montag, 31. März 2014, 11:15–11:30, TRE Phy
Electronic structure and relaxation behavior of a thin Fe(II) spin-crossover film — •Eric B. Ludwig1, Holger Naggert2, Matthias Kalläne1, Sebastian Rohlf1, 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 a ultraviolet photoelectron spectroscopy study on a vacuum-deposited thin film of Fe(H2bpz)2(phen) on Au(111).
Spectral features sensitive to the spin transition can
be identified via comparison of the results of density functional calculations with the results of valence band measurements at different temperatures
and varying irradiation conditions.
Our results provide evidence for
a VUV-induced spin-state trapping effect at low temperatures. Furthermore, a high optical photon flux seems to stabilize the metastable high-spin
state far above the LIESST transition temperature.
The overall high- to low-spin relaxation behavior, however, shows similarities to amorphous samples of a related system.