Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)
MA 19.38: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
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, thus accessing a quantum critical point (QCP). In proximity to its QCP NbFe2 exhibits non-Fermi-liquid behavior, which makes this material the first clear candidate for a three dimensional ferromagnetic QCP within the transition metals. We present Hall effect measurements on two selected samples of the Nb1−yFe2+y solution series. The data are analyzed in terms of anomalous and normal contributions to the Hall voltage. The normal contribution is expected to give insight into the electronic structure whereas the anomalous contributions may help to clarify the yet unresolved magnetic properties close to the QCP.