Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 14: Spin Systems and Itinerant Magnets
TT 14.2: Vortrag
Dienstag, 27. März 2007, 14:15–14:30, H19
Hall effect and magnetoresistance in weakly ferromagnetic CeSix and heli-magnetic MnSi — Andreas Neubauer1, Christian Pfleiderer1, Philipp Niklowitz1, Robert Ritz1, •Peter Böni1, Dmitri Souptel2, and Günter Behr2 — 1Physik Department E21, Technische Universität München, D-85748 Garching, Germany — 2IFW Dresden, PF 270116, D-01171, Dresden, Germany
We report a comparison of the magnetoresistance and Hall effect in single crystals of the easy-plane ferromagnet CeSix (x≈1.81) with that observed in the helical magnet MnSi. In CeSix the anomalous Hall effect clearly tracks the ordered moment as function of temperature and magnetic field. It may be used as a simple means to establish the presence of a ferromagnetic quantum phase transition under pressure. The behavior seen in ferromagnets CeSix is contrasted by anomalous contributions to the Hall effect in MnSi, which suggest an important scale of order 100K. Further, in MnSi only subtle differences in the temperature dependences of the Hall effect near a quantum phase transition may be expected. We compare a conventional analysis in the framework of additive charge carrier relaxation rates with the more recent proposal of additive currents.