Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Spin Structures and Magnetic Phase Transitions
MA 18.10: Vortrag
Mittwoch, 25. März 2009, 12:30–12:45, HSZ 401
A generic phase diagram for R2PdSi3 (R = heavy rare earth)? — •Matthias Frontzek1, Fei Tang1, Peter Link2, Jens-Uwe Hoffmann3, Jean-Michel Mignot4, and Michael Loewenhaupt1 — 1TU Dresden, Institut für Festkörperphysik, D-01062 Dresden — 2Forschungsneutronenquelle Heinz-Maier-Leibnitz, Lichtenbergerstr. 1, D-85747 Garching — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Glienickerstr. 100, D-14109 Berlin — 4Laboratoire Léon Brillouin, CE-Saclay, F-91191 Gif-sur-Yvette
The series R2PdSi3 (R = heavy rare earth) crystallize in a special variant of the hexagonal AlB2 structure where the Pd and Si ions order on the B-sites resulting in a crystallographic superstructure. The rare earth ions occupy the Al-sites on a triangular and therefore geometrically frustrated lattice. In zero field the R2PdSi3 order in a rich variety of antiferromagnetic structures. The diversity reflects the influence of the magneto-crystalline anisotropy based on crystal-electric field effect.
The geometric frustration can be lifted by the application of a magnetic field. Apparently this leads to a more generalized behavior as suggested by ac-susceptibility measurements.
In our contribution we will present and combine results from field dependent ac-susceptibility measurements and magnetic neutron diffraction on single crystalline R2PdSi3 for selected samples. The existence of a general high-field magnetic structure and a generic behavior for all R2PdSi3 will be discussed. Its connection to a special variant of the AlB2 crystallographic structure will be emphasized.