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Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 26: Elektronentheorie

MA 26.6: Vortrag

Donnerstag, 27. März 2003, 16:30–16:45, HSZ/401

Lineshape and Relaxation Studies on Mn12ac — •Suriyakan Vongtragool1, Boris Gorshunov1, Martin Dressel1, and Alexandra Mukhin211.Physikalisches Institut, Universität stuttgart, Germany — 2General Physics Institute, Russian Academy of Sciences, Moscow, Russia

The molecular magnet Mn12ac has a high spin S=10 ground state. Direct observations of the crystal field transitions by using a frequency-domain magnetic spectroscopy provide the corresponding zero field splitting parameters. Investigation of magnetodipole transitions lineshape (Gaussian) and linewidth in single crystals gives information on the cluster environment and internal fields. Depending on history, symmetric zero-field cooled (zfc) or asymmetric (fc) lineshapes are obtained due to inhomogeneous broadening with Δ D=0.01D.We also present the detailed studies of quantum tunneling and relaxation phenomena which are directly observed by our technique, which can probe local populations of separate spin states. The spin relaxation of Mn12ac is studied by reversing the external magnetic field. Below T≈ 2 K resonant quantum tunneling is directly observed as a tunnel dip in the absorption spectra of polycrystals.

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