Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: Frustrated Magnets - Chiral Magnets & RuCl₃

TT 34.1: Vortrag

Dienstag, 8. März 2016, 14:00–14:15, H20

Experimental determination of the Fermi surface in the itinerant helimagnet 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

Manganese silicide (MnSi) is an itinerant helimagnet that has been studied for over five decades. Its cubic crystal structure lacks inversion symmetry. The strong electronic correlations in MnSi result in a rich phase diagram with a helimagnetic ground state. Further, MnSi is the material in which the topologically exotic skyrmion lattice phase has been discovered [1]. This triggered a large interest. However, a thorough experimental determination of the Fermi surface (FS) of bulk MnSi is still lacking. In our experiment, we employ torque magnetometry at low temperatures T and in high magnetic fields B to measure the magnetization M of high-quality, single-crystalline bulk samples of MnSi. We observe quantum oscillations in M(B), i.e. the de Haas-van Alphen effect, with multiple frequencies which correspond to extremal cross sections of the FS. We study the angular dependence of these oscillations and extract the effective electron masses from the temperature dependence of the oscillation amplitudes. The experimental findings are compared to the FS calculated via density functional theory.
[1] S. Mühlbauer et al., Science 323, 915 (2009)