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Regensburg 2004 – scientific programme

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M: Metallphysik

M 22: Intermetallische Phasen

M 22.2: Talk

Wednesday, March 10, 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 Schultz11Leibniz-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.

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