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Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Correlated Electrons: Spin Systems, Itinerant Magnets 2

TT 17.5: Talk

Monday, March 11, 2013, 16:00–16:15, H19

Long-wavelength helimanegtic order and skyrmion lattice phase in Cu2OSeO3Alfonso Chacon1,2, •Tim Adams1, Michael Wagner1, Andreas Bauer1, Georg Brandl1,2, Bjoern Pedersen2, Helmuth Berger3, Peter Lemmens4, and Christian Pfleiderer11Technische 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 — 4Institute for Condensed Matter Physics, TU Braunschweig, D-38106 Braunschweig, Germany

We report a long-wavelength helimagnetic superstructure in bulk samples of the ferrimagnetic insulator Cu2OSeO3. The magnetic phase diagram associated with the helimagnetic modulation inferred from small-angle neutron scattering and magnetization measurements includes a skyrmion lattice phase and is strongly reminiscent of MnSi, FeGe, and Fe1−xCoxSi, i.e., binary isostructural siblings of Cu2OSeO3 that order helimagnetically. The temperature dependence of the specific heat of Cu2OSeO3 is characteristic of nearly critical spin fluctuations at the helimagnetic transition. This provides putative evidence for effective spin currents as the origin of enhancements of the magnetodielectric response instead of atomic displacements considered so far.

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