Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Correlated Electrons: Poster Session
TT 32.22: Poster
Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B
High-pressure magnetization measurements on single-crystalline CoS2 — •Sandra Drotziger1, Kai Grube2, Marc Uhlarz1, Christian Pfleiderer3, John Wilson4, and Hilbert von Löhneysen1,2 — 1Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe — 2Forschungszentrum Karlsruhe, Institut für Festkörperphysik, 76021 Karlsruhe — 3Physik Department E21, Technische Universität München, 85748 Garching — 4H.H. Wills Physics Laboratory, University of Bristol, UK
Suppression of magnetic order in weak itinerant magnets has recently attracted scientific interest due to novel phases emerging in the vicinity of a quantum phase transition. Among these systems, the pyrite compound CoS2 is a promising candidate for general considerations as it has a simple cubic structure with high magnetic isotropy. At TC≈122 K CoS2 develops ferromagnetic order with a spontaneous moment of µs = 0.84 µB/Co. With increasing pressure the ferromagnetism is suppressed to lower temperatures and the order of the phase transition changes from second to first order at the tricritical point p*≈ 0.1 GPa [1]. For p > p* a first order field-induced phase transition is observed. We report pressure studies of the DC magnetization measurements on CoS2 single crystals as a function of temperature down to 2.3 K and magnetic field up to 12 T. The measurements were performed in a miniaturized diamond anvil cell made of a non-magnetic CuBe alloy. The temperature of the metamagnetic transition increases linearly, with a slope almost independent of p.
[1] S. Barakat, PhD Thesis, University of Cambridge (2001).