Regensburg 2016 – scientific programme

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.72: Poster

Tuesday, March 8, 2016, 09:30–12:30, Poster B1

Cantilever Magnetometry on MnSi — •Matthias Dodenhöft¹, Schorsch Michael Sauther¹, Stephan Gerhard Albert¹, Felix Rucker², Andreas Bauer², Marc Andreas Wilde¹, Christian Pfleiderer^1,2, and Dirk Grundler^1,3 — ¹Phys.-Dep. E10, TU München — ²Phys.-Dep. E51, TU München — ³LMGN, IMX, STI, EPF Lausanne

Since the discovery of the Skyrmion lattice phase in 2009, the B20 compound MnSi has attracted much attention. However, a detailed experimental investigation of the Fermi Surface (FS) of bulk MnSi is still missing in literature. Existing density functional theory (DFT) band structure calculations are restricted by the strong electronic correlations present in MnSi. Therefore, a verification of the predicted FS by experiments is essential. Following a short report by Taillefer et al. (1986), we present de Haas-van Alphen (dHvA) measurements using cantilever magnetometry with a capacitive read-out. The Dingle temperatures extracted from experiment confirm an excellent sample quality enabling a detailed determination of the FS via the dHvA effect. Extracted frequency components of the dHvA signal are tracked for different field orientations in the (100), (110) and (211) plane and their evolution is compared with DFT results. Measurements for a fixed field orientation at different temperatures enable the determination of the effective mass of the orbits corresponding to each frequency component. We find effective masses that are strongly enhanced if compared to the bare band masses. We attribute this to electronic correlations not considered by DFT.