Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Correlated Electrons: Spin Systems and Itinerant Magnets 1

TT 3.8: Vortrag

Montag, 23. März 2009, 12:15–12:30, HSZ 304

Skyrmion Lattice in Fe_1−xCo_xSi — •Wolfgang Münzer¹, Christian Franz¹, Andreas Neubauer¹, Sebastian Mühlbauer¹, Tim Adams¹, Florian Jonietz¹, Christian Pfleiderer¹, Benedikt Binz², Achim Rosch², Robert Georgii³, Peter Böni¹, Martin Schmid⁴, and Juri Grin⁴ — ¹Physik Department E21, Technische Universität München, D-85748 Garching, Germany — ²Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, D-85748 Garching, Germany — ³ITP, University of Cologne, Zülpicher Str. 77, D-50937 Cologne, Germany — ⁴Max Planck Institut für Chemische Physik fester Stoffe, 01187, Dresden, Germany

The recent identification of the A-phase in MnSi as a hexagonal lattice of anti-skyrmions raises the question, if skyrmion lattice ground states exist in further members of the series of B20 transition metal compounds. We have grown single crystals of selected compositions in the series Fe_1−xCo_xSi by means of vapor transport and optical float zoning. Our samples are consistent with the previously reported temperature versus composition phase diagram. Comprehensive neutron scattering and magneto-transport measurements establish an extremely rich magnetic phase diagram of skyrmion phases as a function of magnetic field strength, temperature and direction.