Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Bio- and Molecular Magnetism
MA 3.4: Vortrag
Montag, 14. März 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 LaIII ions replaced by magnetic rare earth ions.