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MA: Fachverband Magnetismus

MA 3: Bio- and Molecular Magnetism

MA 3.4: Talk

Monday, March 14, 2011, 11:45–12:00, HSZ 401

Magnetic Model for Mn₂La₂ Developed from Spectroscopic Studies with Inelastic Neutron Scattering and Frequency-Domain Fourier-Transform THz EPR — •R. Milazzo¹, J. Nehrkorn¹, S. Stuiber¹, O. Waldmann¹, M. N. Akhtar², Y. Lan², A. K. Powell², H. Mutka³, J. Dreiser⁴, A. Schnegg⁵, and K. Holldack⁶ — ¹Physikalisches Institut,Universität Freiburg, Germany — ²Institut für Anorganische Chemie, Universität Karlsruhe, KIT, Germany — ³Institut Laue Langevin, Grenoble, France — ⁴Swiss Light Source, Paul Scherrer Institut, Switzerland — ⁵Helmholtz-Zentrum Berlin, Institut für Silizium-Photovoltaik, Germany — ⁶Helmholtz-Zentrum Berlin, Institut für Synchrotonstrahlung, Germany

Molecular nanomagnets which contain several magnetic centers with a large single-ion magnetic anisotropy are of general interest, because they could lead to interesting phenomena such as single-molecule magnet (SMM) behavior. We performed spectroscopic experiments on Mn₂La₂ using inelastic neutron scattering at the direct time-of-flight disc chopper spectrometer IN5 at ILL and the newly developed frequency-domain Fourier-transform THz EPR at BESSY. Based on the experimental results a magnetic model has been developed. It will be discussed why no SMM behavior was observed, even though Mn₂La₂ exhibits a remarkably high energy barrier of about 37 K for spin relaxation. Furthermore our results can be applied to analogous clusters, with the diamagnetic La^III ions replaced by magnetic rare earth ions.