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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.53: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Magnetic Properties of Cu₂OSeO₃ under weak doping — Markus Strobl¹, •Marco Halder¹, Tim Adams¹, Sebastian Mühlbauer², Michael Wagner¹, Andreas Bauer¹, Helmut Berger³, and Christian Pfleiderer¹ — ¹Technische Universität München, Physik-Department E21, D-85748 Garching, Germany — ²Forschungsneutronenquelle Heinz Maier Leibnitz (FRM II), Lichtenbergstr. 1, 85748 Garching, Germany — ³Ecole Polytechnique Federale Lausanne, CH-1015 Lausanne, Switzerland

The magnetoelectric Cu₂OSeO₃ is the first established insulator within the class of cubic chiral helimagnets crystallizing with space group P2₁3. Perhaps most fascinating, these compounds give rise to a regular lattice of topologically non-trivial spin whirls, the so-called Skyrmion lattice. The magnetoelectric coupling in Cu₂OSeO₃ thereby promises novel phenomena compared to itinerant magnets such as MnSi, Fe_1−xCo_xSi, or FeGe. While in the latter systems the influence of doping on the magnetic properties was already investigated in detail, no corresponding data are available for Cu₂OSeO₃. Here, we report a comprehensive study by means of magnetization and small-angle neutron scattering focusing on the determination of the magnetic phase diagram of vapor-transport-grown samples of Cu₂OSeO₃ substitutionally doped with various transition metals.