Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 98: Electronic structure: Surface magnetism and spin phenomena I
O 98.7: Vortrag
Donnerstag, 15. März 2018, 16:45–17:00, MA 042
Inelastic Spin- and Vibrational Excitations on FeTPyP on Au(111) — •Daniela Rolf1, Friedrich Maaß2, Christian Lotze1, Benjamin W. Heinrich1, Constantin Czekelius3, Petra Tegeder2, and Katharina J. Franke1 — 1Freie Universität Berlin — 2Universität Heidelberg — 3Heinrich-Heine Universität Düsseldorf
Porphyrin molecules constitute a class of well-investigated molecules, because of their versatility in terms of self-assembly and electronic and magnetic properties. Numerous studies have been performed with various central metal atoms on different metal surfaces, showing that by a suitable choice of metal center and surface, the molecular properties can be tailored. Interesting phenomena were observed, including the Kondo effect, vibronic coupling and negative-differential resistance. Here, different arrangements of Fe-tetra-pyridil-porphyrin (Fe-TPyP) molecules were investigated on a Au(111) substrate. Employing a low-temperature STM, we show that depending on the molecular geometry, a different number of steps in the dI/dV signal can be observed symmetrically around the Fermi level, with energies up to 115meV. Comparison to HREELS measurements allows for an unambigous identification of vibrational excitations. The lowest energy steps correspond to spin excitations. We correlate the variations in the spectral features to different magnetic ground states and d-level alignments originating from distinct molecular configurations of the self-assembled structures.