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MA: Fachverband Magnetismus

MA 3: Bio- and Molecular Magnetism

MA 3.5: Talk

Monday, March 14, 2011, 12:00–12:15, HSZ 401

First results obtained with the new frequency-domain Fourier-transform THz electron paramagnetic resonance technique on single-molecule magnets — •Jan Dreiser^1,2, Kasper S. Pedersen³, Joscha Nehrkorn², Alexander Schnegg⁴, Karsten Holldack⁴, Magnus Schau-Magnussen³, Philip Tregenna-Piggott⁵, Hannu Mutka⁶, Hoegni Weihe³, Jesper Bendix³, and Oliver Waldmann² — ¹Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI — ²Physikalisches Institut, Universität Freiburg, D-79104 Freiburg — ³Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen — ⁴Helmholtz-Zentrum Berlin, D-12489 Berlin — ⁵Paul Scherrer Institut, Lab. for Neutron Scattering, CH-5232 Villigen PSI — ⁶Institut Laue-Langevin, F-38042 Grenoble

Single-molecule magnets are molecular spin clusters exhibiting slow relaxation of magnetization. In order to understand the interplay of anisotropy and exchange interaction within these clusters, spectroscopic measurements are needed in addition to magnetization and susceptibility studies. Recently, a new frequency-domain Fourier-transform electron paramagnetic resonance technique working in the THz range (FD-FT THz-EPR) has been developed at the BESSY storage ring in Berlin. In this contribution we present first results obtained with this technique. We further discuss the THz-EPR spectra in the context of inelastic neutron scattering, magnetization and susceptibility measurements.