Regensburg 2013 – wissenschaftliches Programm
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AGjDPG: Arbeitsgruppe junge DPG
AGjDPG 2: Topological Defects in Magnetic Materials: from Devices to Cosmos
(PhD-Student Symposium jointly with MA)
AGjDPG 2.4: Vortrag
Dienstag, 12. März 2013, 10:45–11:00, H16
Giant generic topological Hall resistivity of MnSi under pressure — •Robert Ritz1, Marco Halder1, Christian Franz1, Andreas Bauer1, Michael Wagner1, Robert Bamler2, Achim Rosch2, and Christian Pfleiderer1 — 1Physik-Department E21, Technische Universität München — 2Institut für Theoretische Physik, Universität zu Köln
We report detailed low temperature magneto-transport and magnetization measurements in MnSi under pressures up to ∼12 kbar. Tracking the role of sample quality, pressure transmitter, and field and temperature history allows us to link the emergence of a giant topological Hall resistivity ∼50 nΩ cm to the skyrmion lattice phase at ambient pressure. We show that the remarkably large size of the topological Hall resistivity in the zero temperature limit must be generic. We discuss various mechanisms which can lead to the much smaller signal at elevated temperatures observed at ambient pressure.