Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Correlated Electrons: Frustrated Magnets - Chiral Magnets & RuCl3
TT 34.2: Vortrag
Dienstag, 8. März 2016, 14:15–14:30, H20
Uniaxial pressure dependence of magnetic order in MnSi — •Alfonso Chacon1, Andreas Bauer1, Tim Adams1, Felix Rucker1, Georg Brandl1,2, Robert Georgii1,2, Markus Garst3, and Christian Pfleiderer1 — 1Physik Department, Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany — 2Heinz Maier Leibnitz (MLZ), Technische Universität München, Lichtenbergstr., D-85748 Garching, Germany — 3Institute for Theoretical Physics, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
We report the ac susceptibility and small angle neutron scattering (SANS) of the helical order, conical phase and skyrmion lattice phase (SLP) in MnSi under uniaxial pressures. For all crystallographic orientations uniaxial pressure imposes a strong easy-axis anisotropy along the pressure axis on the modulation direction . In turn, under applied magnetic fields uniaxial pressure favours the magnetic order for which a magnetic modulation is closest to the pressure axis. In particular, uniaxial pressures perpendicular to the magnetic field axis enhance the SLP strongly on the expense of the conical phase, whereas the SLP is suppressed for pressure parallel to the field. Yet, for both orientations key characteristics of the SANS pattern of the SLP remain essentially unaffected. Our results establish how strain allows to control skyrmions in chiral magnets.