Dresden 2011 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 23: Nonlinear Waves/ Nonlinear Lattices
DY 23.8: Vortrag
Mittwoch, 16. März 2011, 16:00–16:15, ZEU 255
Lattice dynamics in the itinerant helical magnet MnSi — •Daniel Lamago1,2, Evgeni Clementyev3,4, Alexander Ivanov5, Rolf Heid1, Jean-Michel Mignot2, A.E. Petrova6, and Pavel A. Alekseev3 — 1Karslruhe Institut für Technologie (KIT), Institut fuer Festkoerperphysik, P.O.B. 3640, 76021 Karlsruhe, Germany — 2Laboratoire Leon Brillouin, CEA Saclay, 91191 Gif sur Yvette Cedex, France — 3ISSSPh, Russian Research Centre Kurchatov Institute, 123182 Moscow, Russia — 4LNS, Institute for Nuclear Research, Russian Academy of Sciences, Troitsk, Moscow Region, Russia — 5Institut Laue Langevin, 38042 Grenoble Cedex 9, France — 6Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk 142190, Moscow Region, Russia
The phonon dispersion relations in MnSi were measured using inelastic neutron scattering. At the same time, calculations of the lattice dynamics of MnSi were carried out in the framework of the density-functional theory using both the local-density and the generalized gradient approximations. The calculations match most of the phonon modes in the frequency range up to 40 meV, if they are performed using the experimental lattice constant. Spin-polarized calculations for ferromagnetic ground states result in subtle modifications of the dispersion curves, which further improve the description, in particular, for the acoustic branches.