Regensburg 2013 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

AGjDPG: Arbeitsgruppe junge DPG

AGjDPG 2: Topological Defects in Magnetic Materials: from Devices to Cosmos
(PhD-Student Symposium jointly with MA)

AGjDPG 2.4: Talk

Tuesday, March 12, 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.