Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 8: Intermetallic Phases II

MM 8.3: Vortrag

Montag, 22. März 2010, 12:00–12:15, H5

Magnetic properties of Pr₂PdSi₃ single crystals — •Yiku Xu^1,2, Fei Tang³, Matthias Frontzek³, Wolfgang Löser¹, Günter Behr¹, Bernd Büchner¹, and Lin Liu² — ¹IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — ²State Key Laboratory of Solidification Processing, Northwestern Polytechnical University,Xi’an, Shaanxi 710072, PR China — ³Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany

Ternary R₂TSi₃ intermetallic compounds (R = Rare Earth, T = Transition Metal) with hexagonal AlB₂-type crystallographic structure are known because of their interesting physical properties. Pr₂PdSi₃ single crystals were grown by a vertical floating zone method. The compound exhibits congruent melting behavior at a liquidus temperature of about 1770^∘C. Single crystalline samples show a huge anisotropy at low temperatures due to the crystal electric field effect and order antiferromagnetically below the Néel temperature T_N = 2.17 K. This value approximately obeys the linear de Gennes scaling for this class of compounds. The [0 0 1] orientation was identified as the magnetic easy axis at room temperature. At lower temperature (≈ 20 K) magnetic easy and hard axes interchange with each other. Two additional magnetic phase transitions were observed at temperatures below 1 K.