Regensburg 2004 – scientific programme
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TT: Tiefe Temperaturen
TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”
TT 24.31: Poster
Wednesday, March 10, 2004, 14:30–19:00, Poster A
Ferromagnetic to paramagnetic quantum phase transition of single crystal CeSi1.81 at high pressure — •S. Drotziger1, C. Pfleiderer1, M. Uhlarz1, H. v. Löhneysen1,2, D. Souptel3, W. Löser3, and G. Behr3 — 1Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsuhe — 2Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsuhe — 3Institut of Solid State and Materials Research Dresden, Postfach 270116, D-01171 Dresden
Silicon deficient CeSi2−x crystallizes over a large range of compositions in the orthorhombic α-GdSi2 structure. Below a critical Si content, easy-plane ferromagnetism is observed. Being one of the rare examples of a ferromagnetic Ce compound, the nature of this ferromagnetic state has been studied intensively in the past. Here we report a high pressure study of the magnetisation of a new generation of CeSi2−x single crystals grown with an optical floating zone furnace under ultrapure conditions. In CeSi1.81 where TC=9.5 K, moderate pressures are sufficient to suppress ferromagnetism. The easy-plane ferromagnetic to paramagnetic quantum phase transition is compared with the predictions of weak-coupling spin fluctuation theory.