Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Correlated Electrons - Poster Session
TT 20.49: Poster
Mittwoch, 28. März 2007, 14:00–17:45, Poster A
Low-Temperature Antiferromagnetic Phase Transition in α-YbPdSn — •Tobias Görlach1, Sergiy Putselyk1, Andreas Hamann1, Tihomir Tomanic1, Falko Schappacher2, Rainer Pöttgen2, and Hilbert v. Löhneysen1,3 — 1Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany — 2Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstr. 30, D-48149 Münster, Germany — 3Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany
Ternary intermetallic compounds of the type YbTX where T is a transition metal and X is a main group metal, show a wide variety of magnetic properties at low temperatures [1]. More specifically, stannides (X=Sn) show different types of magnetic order. While YbNiSn orders ferromagnetically at TC=5.6 K, YbRhSn and YbPtSn order antiferromagnetically at 1.85 K and 3.5 K, respectively, YbPtSn also being metamagnetic. Here we present evidence for magnetic order at very low temperatures in YbPdSn, whose magnetic properties have previously been investigated at temperatures above 4.2 K only. Our low-temperature measurements of the specific heat and the magnetic susceptibility indicate an antiferromagnetic phase transition at 200 mK which is suppressed rapidly in moderate magnetic fields.
[1] R. Pöttgen, D. Johrendt and D. Kußmann, in: Handbook of the Physics and Chemistry of the Rare Earths (Elsevier Science B.V., Amsterdam, 2001), vol. 32, ch. 207, pp. 455–515.