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Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: CE: Spin Systems and Itinerant Magnets

TT 22.10: Vortrag

Mittwoch, 24. März 2010, 12:00–12:15, H21

Quantum Phase Transitions in Single-Crystal Mn1−xFexSi and Mn1−xCoxSi: II. Small Angle Neutron Scattering — •Tim Adams1, Sebastian Mühlbauer1, Andreas Bauer1, Andreas Neubauer1, Christian Franz1, Robert Georgii2, Peter Böni1, and Christian Pfleiderer11Technische Universität München, Germany — 2Forschungsneutronenquelle Heinz Maier-Leibnitz, Garching, Germany

We report a comprehensive small angle neutron scattering study of the evolution of the magnetic phase diagram in Mn1−xFexSi and Mn1−xCoxSi. With increasing concentration x the magnetic phase diagram remains essentially unchanged, exhibiting a well defined helimagnetic, conical and Skyrmion lattice phase up to X≈ 0.5xc, where xc is the critical concentration for which the helimagnetic transition temperature vanishes. Surprisingly, for concentrations xxc the magnetisation, susceptibility and specific heat are still akin the magnetic phase diagram of pure MnSi, but small angle neutron scattering suggests the emergence of complex spin textures. Similarities and differences with the pressure-temperature phase diagram of pure MnSi and the doped semiconductor Fe1−xCoxSi will be discussed.

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