k-space asymmetry of low-energy excitations in the chiral magnet MnSi
We have successfully observed by ferromagnetic NSE the effects on neutron energy of the asymmetric dispersion curves predicted for the skyrmion lattice phase of MnSi. This phenomenon - that the excitation energies depend on whether q is parallel or antiparallel to the magnetic field - is predicted to arise due to the Berry phase of the skyrmions. We now propose to carry out an experiment in the same geometry but at a lower magnetic field, so that the magnetic ordering in MnSi is helical, where no asymmetry is predicted; however, this prediction should be checked. For a helical magnet, the scattered intensity depends on the angle between q and the applied magnetic field (which determines the polarisation axis), so it is important to establish whether the energy transfers are independent of this angle.
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FORGAN Edward M.; BLACKBURN Elizabeth; CAMPILLO Emma; FURUKAWA K. Hazuki; HOFFMANN Ingo; Vasyl Ryukhtin and SODA Minoru. (2021). k-space asymmetry of low-energy excitations in the chiral magnet MnSi. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1645
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