Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Correlated Electrons: Spin Systems and Itinerant Magnets 1
TT 38.12: Vortrag
Donnerstag, 29. März 2012, 12:45–13:00, H 3010
Uniaxial pressure studies of helimagnetic order and the skyrmion lattice phase in MnSi — •Alfonso Chacón Roldán1, Andreas Bauer1, Tim Adams1, Georg Brandl1,2, Robert Georgii2, Peter Böni1, and Christian Pfleiderer1 — 1Technische Universität München, Physik-Department E21, D-85748 Garching, Germany — 2Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), D-85748 Garching, Germany
We report small angle neutron scattering and ac susceptibility measurements of the uniaxial pressure dependence of the helimagnetic order and the skyrmion lattice phase in MnSi. For our studies a bespoke sample stick with a He-activated bellow system has been built that permits simultaneous neutron scattering and susceptibility measurements. We find that both the helimagnetic order as well as the skyrmion lattice phase are very sensitive to the application of uniaxial stress. Besides a reorientation of the skyrmion lattice the most prominent effect is either a pronounced suppression or an enhancement of the skyrmion lattice phase depending on the field and stress direction. We discuss our results in the context of the mechanism that stabilises the skyrmion lattice phase.