Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Correlated Electrons: Quantum-Critical Phenomena 1

TT 17.6: Vortrag

Dienstag, 24. März 2009, 15:30–15:45, HSZ 03

Pressure Dependence of the Magnetotransport Properties of MnSi — •Robert Ritz, Christian Pfleiderer, Andreas Neubauer, Philipp Niklowitz, and Peter Böni — Physik Department E21, Technische Universität München, D-85748 Garching, Germany

The temperature dependence of the resistivity of the itinerant-electron magnet MnSi suggests the emergence of an extended non-Fermi liquid regime above a critical pressure p_c=14.6 kbar. Various neutron scattering studies suggest that this state may not be related to quantum criticality, where one of the most promising scenarios concerns the spontaneous formation of topologically non-trivial spin textures composed of skyrmions. We report measurements of the low-temperature magnetoresistance and Hall-effect under pressure in excess of 40 kbar and magnetic field up to 14 T. We discuss our findings in the light of the recent discovery of a skyrmion lattice and a related topological Hall effect in MnSi at ambient pressure.