Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Bio- and Molecular Magnetism
MA 2.6: Vortrag
Montag, 22. März 2010, 12:00–12:15, H10
Magnetization measurements of a novel family of heteronuclear Mn2Ni3 SMM clusters — •Klaus Gieb1, Animesh Das2, Yulia Krupskaya3, Wolfgang Kroener1, Serhiy Demeshko2, Rüdiger Klingeler3, Vladislav Kataev3, Bernd Büchner3, Franc Meyer2, and Paul Müller1 — 1Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany — 2Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Germany — 3Leibniz-Institute for Solid State and Materials Research IFW Dresden, Germany
We report on magnetic measurements of two hetrometallic Mn2IIINi3IIX2L4(LH)2(H2O)2 (X = Cl, Br) complexes. These compounds have a ground state spin of S = 7 and show an easy-axis type of anisotropy. DC and AC susceptibility measurements were performed with a commercial SQUID magnetometer. A home-made micro-Hall-probe magnetometer was used to perform the characterization at mK temperatures. We found an uniaxial anisotropy parameter of D ≃ −0.5 K. Magnetic hysteresis and quantum tunneling of magnetization was observed at temperatures below a blocking temperature TB ≃ 1.5 K. The shape of the hysteresis loop is influenced by intermolecular interactions. The signature of these interactions can be modified by the variation of the Mn coordination partner X.