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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.146: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Single crystal growth and magnetic structure investigations of Er₂PdSi₃ and Tm₂PdSi₃ intermetallic compounds. — •Irina Mazilu ¹, Wolfgang Löser¹, Günter Behr¹, Matthias Frontzek², Jürgen Eckert³, and Ludwig Schultz¹ — ¹IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — ²Institute for Physics of Solids, TU Dresden, D- 01062 Dresden, Germany — ³Material Science Department, TU Darmstadt, D-64287 Darmstadt, Germany

R₂PdSi₃ (R = rare earth) intermetallic compounds exhibit a hexagonal AlB2 type crystal structure. They show strongly anisotropic magnetic properties and complex magnetic ordering. Er₂PdSi₃ and Tm₂PdSi₃ single crystals were grown by a floating zone technique with radiation heating in a vertical double ellipsoid configuration. The principal features of the growth process have been investigated and will be discussed.

Magnetic susceptibility and magnetization measurements of the single crystal samples reveal an antiferromagnetic order, with transitions temperatures for Er₂PdSi₃ and Tm₂PdSi₃ of 7 K and 2 K, respectively. The investigations which have been performed on samples with different crystallographic orientation, show a pronounced anisotropy of properties which primarily depends on the 4f-orbital shape of the rare earth element. Neutron diffraction experiments have been performed from 0.4 K to 300 K on the Er₂PdSi₃ and Tm₂PdSi₃ single crystals. The magnetic easy axis is along the c-axis of the hexagonal structure for both compounds, whereas the propagation vectors are τ = (0.11 0.11 0) for Er₂PdSi₃ and τ = ( 1/2 1/2 1/16 ) for Tm₂PdSi₃.