Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques
MA 20.21: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Normal and anomalous Hall effect in NbFe2 — •Sven Friedemann1, Manuel Brando2, William J Duncan3, Andreas Neubauer4, Christian Pfleiderer4, and Malte Grosche1 — 1University of Cambridge, Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE Cambridge, United Kingdom — 2Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany — 3Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, United Kingdom — 4Physik Department E21, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany
The intermetallic system NbFe2 exhibits ferromagnetic and antiferromagnetic order, which can be suppressed by slight changes to the composition within the Nb1−yFe2+y homogeneity range. A quantum critical point (QCP) arises at slight Nb excess of about y=0.015. In proximity to its QCP NbFe2 exhibits non-Fermi-liquid behaviour, which makes this material the first clear candidate for a three dimensional ferromagnetic QCP in a clean transition metal compound at ambient pressure. We present Hall effect measurements on several single crystals chosen from the Nb1−yFe2+y solution series. The data are analysed in terms of anomalous and normal contributions to the Hall voltage. We find anomalous contributions arising from both Side Jump and Skew Scattering with distinct changes in their relative strength as a function of Nb content. The normal contribution reflects the electronic structure.