Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Bio- and Molecular Magnetism II
MA 21.5: Vortrag
Dienstag, 15. März 2011, 12:00–12:15, HSZ 401
Magnetization measurements of a {MnMn6}(CH3H5O3)3 single-molecule magnet — •Klaus Gieb1, Wolfgang Kroener1, Carl-Georg Freiherr von Richthofen2, Thorsten Glaser2, and Paul Müller1 — 1Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany — 2Fakultät für Chemie - Lehrstuhl Anorganische Chemie I, Universität Bielefeld, Germany
We present low-temperature magnetization measurements of a novel {MnMn6}(CH3H5O3)3 complex. The measurements at mK temperatures were carried out with a home-made micro-Hall-probe magnetometer. A commercial SQUID magnetometer was used to collect the susceptibility data. Most of the 3d-ion based single-molecule magnets, known up to now, have a low-lying spin ground state, well separated from the first excited state. In contrast to this property, the first exited state of the present complex can already be reached with moderate magnetic fields. Amazingly, loop magnetization measurements show hysteresis for both the ground state and the first exited state. This leads to a double hysteresis in the low temperature magnetization measurements. The blocking temperature was found to be TB ≈ 1.3 K.