Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 47: Correlated Electrons: Spin Systems and Itinerant Magnets 2

TT 47.1: Talk

Friday, March 30, 2012, 09:30–09:45, H 0104

Single-Crystal Growth and Low Temperature Properties of the Itinerant Antiferromagnet Cr¹¹B₂ — Andreas Bauer¹, •Alexander Regnat¹, Saskia Gottlieb-Schönmeyer¹, Michael Wagner¹, Christian Bluhm², Sabine Wurmehl², Bernd Büchner², and Christian Pfleiderer¹ — ¹Physik-Department E21, Technische Universität München, James-Franck-Straße, D-85748 Garching, Germany — ²Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany

We report the preparation and low temperature properties of the itinerant antiferromagnet Cr¹¹B₂. Large single crystals were grown by means of optical float-zoning, where the feed rods were prepared in a solid state reaction using high purity Cr and B powder in a bespoke tungsten crucible. ¹⁰B depleted boron was used to permit detailed neutron scattering studies. The crystal grown has the highest residual resisitvity ratio reported to date in the literature of 31 and 11 for current along the crystallographic c- and a-directions, respectively [1]. Measurements of the low temperature specific heat, magnetization and electrical resistivity are consistent with SDW type antiferromagnetic order below T_N=88 K [2], which is remarkably insensitive to large applied magnetic fields.
Tanaka et al., J Less-Comm Met, 50, 15 (1967)
Funhashi et al., Solid State Commun, 23, 859 (1977)