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 scattering — Fei Tang¹, •Matthias Frontzek¹, Peter Link², Astrid Schneidewind^1,2, I. Mazilu³, and Michael Loewenhaupt¹ — ¹IFP, 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 T_N = 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.