Regensburg 2004 – wissenschaftliches Programm

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M: Metallphysik

M 22: Intermetallische Phasen

M 22.2: Vortrag

Mittwoch, 10. März 2004, 16:45–17:00, H6

Magnetic Properties and Single Crystal Growth of the Er₂PdSi₃ intermetallic compound. — •Irina Mazilu¹, Wolfgang Löser¹, Günter Behr¹, Kartik K Iyer², P.L. Paulose², E.V. Sampathkumaran², and Ludwig Schultz¹ — ¹Leibniz-Institut for Solid State and Materials Research Dresden, Helmholtzstr. 20, D-01171 Dresden, Germany — ²Tate Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India

Rare Earth (RE)- Transition Metal-Silicides are of general interest for their magnetic and magnetoelectric properties and complex magnetic ordering. Single crystals of Er₂PdSi₃ intermetallic compound with a hexagonal AlB₂ type crystal structure were grown by a floating zone method with optical heating. The control of the oxygen impurity content was the crucial point of crystal growth process. The preferred growth direction was near [10-10]. The crystals exhibits an inferior depletion in Pd and enrichment in Si with respect to the stoichiometric composition. Growth relevant Er-Pd-Si phase diagram features have been revealed by differential thermal analysis and additional microstructure investigations. Magnetic measurement on oriented samples of Er₂PdSi₃ single crystals exhibit antiferromagnetic order with a transition temperature at 7 K and a relative small anisotropy compared to other RE₂PdSi₃, (RE=Tb,Ho). However, anisotropic electrical properties as function of the temperature were revealed. Neutron diffraction studies of the magnetic ordering are in progress.