Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Correlated Electrons: Spin Systems and Itinerant Magnets 1
TT 8.5: Vortrag
Montag, 25. Februar 2008, 15:00–15:15, H 0104
Search for helimagnon excitations in MnSi: an inelastic neutron scattering study — •Florian Bernlochner1, Marc Janoschek1, Peter Böni1, Sarah Dunsiger1, Bertrand Roessli2, Peter Link3, Christian Pfleiderer1, and Achim Rosch4 — 1Physik-Department E21, Technische Universität München, D-85748 Garching, Germany — 2Laboratory for Neutron Scattering, ETH Zürich & Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland — 3Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, D-85748 Garching, Germany — 4Institute of Theoretical Physics, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
The lack of inversion symmetry in the crystal structure of the itinerant-electron magnet MnSi results in weak Dzyaloshinsky-Moriya interactions, that stabilize a long-wavelength spin spiral (λ∼ 190 Å) in the magnetically ordered state. Recent theoretical studies [1-3] predict a rich, novel spectrum of the Goldstone modes, also referred to as helimagnons, for sufficiently small wave vectors near the helical ordering wave vector. We present the results of extensive inelastic neutron scattering studies, in which we explore the nature of the low lying excitations in MnSi in the helically ordered state.
[1] D. Belitz, T. R. Kirkpatrick Phys. Rev. B 72, 180402(R) (2005)
[2] D. Belitz, T. R. Kirkpatrick and A. Rosch Phys. Rev. B 73, 054431 (2006)
[3] S. V. Maleyev, Phys. Rev. B 73, 174402 (2006).