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Dresden 2006 – scientific programme

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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

Tuesday, March 28, 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 Schultz11IFW 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.

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