Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 29: Magnetische Materialien

MA 29.12: Vortrag

Dienstag, 8. März 2005, 18:00–18:15, TU A060

Magnetic properties of single crystalline RE₂PdSi₃ intermetallic compounds. — •Irina Mazilu¹, Wolfgang Löser¹, Günter Behr¹, Matthias Frontzek², E.V. Sampathkumaran³, and Ludwig Schultz¹ — ¹Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, PF 27 01 16, D-01171 Dresden — ²Institut für Festkörperphsyik, Technische Universität Dresden, D- 01062 Dresden — ³TIFR Mumbai, Homi Bhabha Road, Colaba, Mumbai-400005, India

Rare Earth (RE)-Transition Metal-Silicides are of interest for their magnetic and magnetoelectric properties and complex magnetic ordering phenomena. RE₂PdSi₃ intermetallic compounds exhibit a hexagonal AlB₂ type crystal structure. Single crystals of compounds with various rare earth elements RE = Tb, Dy, Ho, Er, Gd, Tm were grown by a floating zone method. The magnetic measurements on samples with different crystallographic orientation revealed magnetic ordering transitions between 2 and 23 K. The considerable anisotropy of susceptibility and magnetization primarily depends on the orbital shape of the rare earth element. The anisotropy of electrical conductivity as function of the temperature is less pronounced but related to the magnetic order. Some compounds, display an anisotropic giant magnetoresistance with significant differences of the field dependence below and above the magnetic ordering transition temperature. (Supported by DFG/SFB 463.)