Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Spin structures and Magnetic Phase Transitions
MA 15.14: Vortrag
Dienstag, 1. April 2014, 13:00–13:15, HSZ 403
Long range magnetic ordering and spin dynamics in the itinerant magnets V1−xCrxPtGe (x=0...0.2) — Sarah Ackerbauer1, •Helge Rosner1, Andreas Leithe-Jasper1, Pabitra Biswas2, Rustem Khasanov2, and Yuri Grin1 — 1Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden — 2Paul Scherrer Institut, CH-5232 Villigen, Switzerland
Weak itinerant magnets are in the focus of present-day physical studies due to a range of unusual properties, including strong magneto-elastic effects and superconductivity. Despite the large interest in these systems, their theoretical description is far from being fully established. Especially, the interplay or competition of localized moments and band magnetism is only poorly understood. This renders systems composed of usually nonmagnetic elements very suitable for a systematic study of this interplay. Here, we present a joint experimental and theoretical study of the electronic and magnetic properties of the novel compounds V1−xCrxPtGe (x=0...0.2). For x=0 the system exhibits strong spin fluctuations, but does not show long range magnetic order down to 2K. Density functional band structure calculations predict the stabilization of a magnetic ground state by moderate electron doping. We realized this experimentally by Cr substitution on the V site and indicate the development of bulk long range magnetic order with TN up to 15 K by thermodynamic measurements and µSR measurements.