Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 87: Low-Dimensional Systems: Molecular Conductors (jointly with CPP, HL, MA, O)
TT 87.6: Vortrag
Donnerstag, 19. März 2015, 10:45–11:00, H 3010
New Charge Transfer Systems based on PAHs — •Antonia Morherr1, Sebastian Witt1, Martin Baumgarten2, Harald O. Jeschke3, and Cornelius Krellner1 — 1Physikalisches Institut, Goethe Universität Frankfurt, D-60438 Frankfurt am Main — 2MPI für Polymerforschung, D-55128 Mainz — 3Institut für Theoretische Physik, Goethe Universität Frankfurt, D-60438 Frankfurt am Main
The Polycyclic Aromatic Hydrocarbons (PAHs) Picene, Coronene and Phenanthrene attracted strong attention in the last years as first superconducting PAHs when intercalated with potassium [1]. K3Picene shows a Tc of 18 K and the Tc of intercalated Coronene lies between 3.5 K and 15 K [2].
Here, we present charge transfer complexes with PAHs representing donor or acceptor molecules of these complexes. The knowledge of different crystallization modes of these systems, e.g. mixed stack or alternating stack configuration, are important for the physical properties. The complexes were grown by horizontal vapor growth technique or by growth from solution. Crystal structures, electrical transport measurements and spectroscopical investigations are presented in this contribution. In addition to the experimental data, we present band-structure calculations, which were performed by density functional methods. The interpretation of both is one approach to understand growing conditions of different stack configurations and an important step towards the design of new charge transfer complexes.
[1] R. Mitsuhashi et al., Nature 464, 76 (2010)
[2] Y. Kubozono et al., Phys. Chem. Chem. Phys. 13, 16476, (2012)