Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Metal Substrates: Structure, Adsorption and Growth
O 49.4: Poster
Dienstag, 8. März 2016, 18:15–20:30, Poster E
Growth and potassium doping of ultrathin layers of picene on Ag(100) — •Martin Hafermann1, Tobias Huempfner1, Roman Forker1, and Torsten Fritz1,2 — 1Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany — 2Osaka University, Graduate School of Science and Institute for Academic Initiatives, Department of Chemistry, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan
Superconductivity in polycyclic aromatic hydrocarbons (PAH) was discovered in alkali-metal-intercalated solid picene [1]. A more recent study questions the very superconductivity in K3picene and calls for more accurate structural characterizations of such systems, especially of their low-dimensional structures [2]. In this contribution we investigate ultrathin films of potassium-doped picene on Ag(100) to obtain a deeper understanding of the mechanisms causing the superconductive properties of PAHs. To analyze the growth of the pristine picene layers as well as the potassium-doping process we used scanning tunneling microscopy (STM) and distortion-corrected low-energy electron diffraction (LEED). We determined that the epitaxy of the picene monolayer on Ag(100) exhibits a point-on-line coincidence, and that the lattice parameters correspond to a bulk-like unit cell consisting of two molecules, one flat lying and one tilted with respect to the substrate surface. Potassium intercalation into one monolayer picene on Ag(100) led to the formation of a new commensurate phase.
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