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MA: Fachverband Magnetismus

MA 3: Bio- and Molecular Magnetism

MA 3.2: Vortrag

Montag, 26. März 2012, 09:45–10:00, EB 202

Magnetic measurements of a Nickel(II) Double Cubane — •Wolfgang Kroener¹, Andreas Scheurer², Klaus Gieb¹, Rolf W. Saalfrank², Michael Stocker¹, and Paul Müller¹ — ¹Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg — ²Department Chemie und Pharmazie, Lehrstuhl für Anorganische und Allgemeine Chemie, Universität Erlangen-Nürnberg

We investigated an octanuclear chloro-bridged nickel(II) double cubane [({Ni₄^II(µ₃-OH)Cl₃(HL)₃}µ₂-Cl)₂]. Single crystal measurements were performed with a custom 2DEG Hall probe magnetometer. Powder measurements were performed with a commercial SQUID magnetometer. Magnetization measurements show two separated hysteresis loops. Temperature as well as sweep-rate dependencies show single-molecule magnet behavior. The loop around zero magnetic field vanishes at 0.9 K, whereas the one at higher fields closes at 1.3 K. This can be explained by anisotropic coupling of the cubane units with S = 4. Including this fact into the Hamiltonian, all principal features of the hysteresis curve can be described.