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MA: Magnetismus

MA 37: Molecular Magnetism

MA 37.10: Talk

Friday, March 31, 2006, 13:00–13:15, HSZ 403

Quantum Tunneling of the Magnetization in Lanthanide Double-Decker Complexes — •H. Rupp¹, B. Barbara², P. Müller¹, S. Brink³, O. Fuhr³, and M. Ruben³ — ¹Physikalisches Institut III, Universität Erlangen, Germany — ²Laboratoire de Magnétisme Louis Néel, CRNS, Grenoble, France — ³Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Germany

Magnetization hysteresis of dysprosium double-decker single crystals was observed below 4K. For the first time a larger blocking temperature than for Mn acetate was found. The very large anisotropy of rare-earth ions has two opposing effects on the barrier height for reversal of the magnetization: The strong axial anisotropy results in a very large ligand-field splitting, whereas the large transversal anisotropy shortcuts the barrier. The observed steps in the hysteresis are due to quantum tunneling of the magnetization. We interpret these steps and related features in terms of intermolecular exchange, dipole-dipole and hyperfine interactions.