Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.2: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Spin-resolved Photoelectron Spectroscopy of Mn6Cr Single-Molecule-Magnets and of Manganese Compounds as Reference Layers — •Andreas Helmstedt1, Aaron Gryzia1, Niklas Dohmeier1, Norbert Müller1, Armin Brechling1, Marc Sacher1, Ulrich Heinzmann1, Veronika Hoeke2, Thorsten Glaser2, Mikhail Fonin3, Ulrich Rüdiger3, and Manfred Neumann4 — 1Faculty of Physics, Bielefeld University — 2Faculty of Chemistry, Bielefeld University — 3Department of Physics, University of Konstanz — 4Department of Physics, Osnabrueck University
The properties of the manganese-based single-molecule-magnet (SMM) Mn6Cr are studied. This molecule exhibits a large spin ground state of ST=21/2. It contains six manganese centres arranged in two bowl-shaped Mn3-triplesalen building blocks linked by a hexacyanochromate. The Mn6Cr complex can be isolated with different counterions which compensate for its triply positive charge. The spin polarization of photoelectrons emitted from the manganese centres in Mn6Cr SMM after resonant excitation with circularly polarized synchrotron radiation has been measured at selected energies corresponding to the prominent Mn L3VV and L3M2,3V Auger peaks. Spin-resolved photoelectron spectra of the reference substances MnO, Mn2O3 and Mn(II)acetate recorded after resonant excitation at the Mn-L3-edge around 640eV are presented as well. The spin polarization value obtained from MnO at room temperature in the paramagnetic state is compared to XMCD measurements of Mn(II)-compounds at 5K and a magnetic field of 5T.