Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.60: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Experimental Study of the Hall Effect and Magnetoresistance in MnSi — •Andreas Neubauer, Christian Pfleiderer, Philipp Niklowitz, and Peter Böni — Physik Department E21, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany
The itinerant-electron magnet MnSi orders magnetically at Tc=29.5 K. The magnetic state is characterised by a helical modulation along the ⟨111⟩ space diagonal in the cubic B20 structure. Magnetic field suppresses the helical order above 0.6 T. The properties of MnSi are in various ways remarkable. The temperature dependence of the electrical resistivity suggests the emergences of an extended non-Fermi liquid phase above pc=14.6 kbar. Neutron scattering at ambient pressure shows an anomalous field dependence of helical fluctuations which may indicate certain similarities with the presence of partial magnetic order akin liquid crystals observed in a pocket of the NFL-phase. Here we report a detailed study of the Hall effect and the magnetoresistance of MnSi. We focus in particular on normal and anomalous contributions to the Hall effect and consider similarities and differences with conventional ferromagnets.