Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.102: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Magnetic Properties of CeCu2 at low temperatures — •Roland Schedler1, Martin Rotter1, Ulrike Witte1,2, Pavel Svoboda3, Jiri Kulda4, and Michael Loewenhaupt1 — 1TU Dresden, Institut für Angewandte Physik (IAPD), 01062 Dresden (Germany) — 2Hahn-Meitner-Institut (HMI), Glienicker Str. 100, 14109 Berlin(Germany) — 3Charles University, Dept. of Electronic Structures, Praha (CzechRepublic) — 4Institut Laue-Langevin (ILL), BP 156, Grenoble Cedex 9 (France)
Anomalous rare earth and actinide compounds, including the so called Kondo lattices and heavy fermion systems are studied extensively by both experimentalists and theorists. Especially cerium based compounds are investigated because of the fluctuations in the f-shell. These fluctuations strongly modify the low-temperature properties. CeCu2 is a Kondo lattice compound which shows antiferromagnetic ordering at TN=3.5K. The magnetic cerium moments are aligned along the c-axis and oriented antiparallel to each other. The direction of easy magnetisation is the a-direction. A possible scenario for such a behavior is that the antiferromagnetic exchange is strongly anisotropic in the nearly hexagonal ac-plane and competes with the crystal field (CF) anisotropy. For a comprehensive explanation of all measured effects it is necessary to determine the complete set of crystal field parameters. A good set should be able to describe all macroscopic measurements and the neutron spectroscopy data of the crystal field transitions. We present the inelastic measurements of the CF-transitions with polarized neutrons providing detailed informations about the CF-transtion matrix elements.