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Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 14: Poster Ib: Magnetic Materials (1-14); Micro Magnetism/Computational Mag. (15-17); Surface Magnetism (18-22); Spin Structures/Phase Transitions (23-25)

MA 14.6: Poster

Tuesday, March 24, 2009, 10:15–13:00, P1B

Magnetic excitations in R2PdSi3 studied by inelastic neutron scatteringFei Tang1, •Matthias Frontzek1, Peter Link2, Astrid Schneidewind1,2, I. Mazilu3, and Michael Loewenhaupt11IFP, TU Dresden, D-01062 Dresden, Germany — 2FRM II, TU Munich, Lichtenbergstr. 1, 85747 Garching, Germany — 3IFW Dresden, D-01069 Dresden, Germany

R2PdSi3 compounds have been found to exhibit rich magnetic phenomena arising from the interplay between RKKY interaction, crystal electric field effects and geometric frustration due to the derived hexagonal AlB2 structure. The observed crystallographic superstructure further complicates the CEF level scheme.

Inelastic neutron scattering measurements on single crystals of Tm2PdSi3 and Er2PdSi3 have been performed at the cold triple axis spectrometer PANDA in FRM-II. Both compounds order antiferromagnetically at TN = 7 K and 2.1 K respectively; Er2PdSi3 undergoes a second phase transition at T2 = 2 K. Several low lying CEF excitations (below 10 meV) were observed. The intensity of the lowest excitation show strong directional dependence (in HK0 plane for Er2PdSi3 and in HHL plane for Tm2PdSi3), from which the details of the transitional matrix could be deduced. Measurements in magnetic fields up to 13 T show Zeeman splitting of the CEF excitations.

In this contribution we will present and discuss the results of the inelastic neutron scattering experiments and try to entangle the CEF level scheme.

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