Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 41: CE: Spin Systems and Itinerant Magnets 1
TT 41.5: Vortrag
Mittwoch, 16. März 2011, 19:15–19:30, HSZ 105
Higher-order scattering in the Skyrmion lattice in MnSi — •Tim Adams1, Sebastian Mühlbauer1,2, Christian Pfleiderer1, Peter Böni1, and Achim Rosch3 — 1Physik-Department E21, TU München, 85748 Garching, Germany — 2ETH Zürich, Institut für Festkörperphysik, Zürich, Switzerland — 3ITP, Universität zu Köln, Köln, Germany
Recent small angle neutron scattering (SANS) experiments suggest the existence of a skyrmion lattice in the A-phase of the archetypal helical magnet MnSi, where the skyrmion lattice is stabilized by thermal Gaussian fluctuations [1]. Such a skyrmion lattice represents a hexagonal spin crystal composed of topologically stable knots of the spin structure. The observation of a topological Hall effect thereby provided stringent evidence of the topological nature of the spin structure [2]. However, in the first neutron scattering studies only first order Bragg peaks were observed. We report a very careful SANS search for higher order scattering in the A-phase to establish the particle-like nature of the skyrmions forming a lattice. So-called Renninger scans thereby allowed us to clearly distinguish double scattering from higher order scattering. We find clear evidence of second order Bragg peaks. Thus the A-phase in MnSi is indeed a lattice of particle-like knots in the spin structure.
S. Mühlbauer, et al., Science 323, 5916 (2009)
A. Neubauer et al., Phys. Rev. Lett. 102, 186602 (2009)
M. Renninger, Z. Physik, 106, 141-176 (1937)