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TT: Fachverband Tiefe Temperaturen

TT 69: Correlated Electrons: Spin Systems and Itinerant Magnets - Chiral Magnets

TT 69.4: Vortrag

Mittwoch, 2. April 2014, 15:45–16:00, HSZ 204

Anisotropies in the phase transition between helical and conical state in MnSi — •Alfonso Chacon Roldan^1,3, Felix Rucker¹, Michael Wagner¹, Andreas Bauer¹, Tim Adams¹, Markus Garst², and Christian Pfleiderer¹ — ¹Physik Department E21, Technische Universität München, München, Deutschland — ²Institut für Theoretische Physik, Universität zu Köln, Köln, Deutschland — ³Heinz Maier-Leibnitz Zentrum, Garching b. München, Deutschland

We report a comprehensive study of the crystalline anisotropies of the cubic chiral helimagnet MnSi, in which we focus on the transition between the multi-domain helical state at low fields and the single-domain conical state at higher fields. Careful measurements of the magnetization and the transverse susceptibility as well as small-angle neutron scattering were carried out on a spherical sample in order to account for the effects of demagnetization fields. In combiniation with high-precision specific heat data, we establish a consistant picture and determine the cubic anisotropy terms of the free energy quantitatively.