Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Molecular Magnetism
MA 40.2: Vortrag
Donnerstag, 14. März 2013, 15:15–15:30, H23
Substrate Dependent Thermal Deposition of NdPc2 Single Molecules — •Sarah Fahrendorf1,2, Frank Matthes1,2, Claire Besson1,2,3, Paul Kögerler1,2,3, Daniel E. Bürgler1,2, and Claus M. Schneider1,2 — 1Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jülich-Aachen Research Alliance (JARA-FIT), Forschungszentrum Jülich, 52425 Jülich, Germany — 3Institute of Inorganic Chemistry, RWTH Aachen, D-52074 Aachen, Germany
Single molecule magnets play an important role in the field of molecular spintronics. A relevant class of molecules are the lanthanide double-decker phthalocyanines (LaPc2) with only one metal atom in the center of the two organic phthalocyanine ligands. For envisaged spintronics applications it is important to understand the interaction between the substrate and the molecules and its influence on the electronic properties. Here, we study the substrate dependent deposition characteristics of neodymium double-decker phthalocyanines (NdPc2) by means of low temperature scanning tunneling microscopy and spectroscopy (STM and STS). The NdPc2 molecules were in-situ evaporated from a Knudsen cell on clean metallic surfaces such as Au(111), Cu(100), and Fe(110). It is observed that a significant fraction of the double-decker phthalocyanines decompose into two single-decker phthalocyanine molecules. The decomposition probability is found to be strongly substrate dependent. By means of STS-spectra we find that stronger substrate molecule interaction leads to enhanced charge transfer which strengthens the intramolecular electrostatic bonding.