非中心对称MnSi诱导铁磁相中的磁振子色散位移
Magnon dispersion shift in the induced-ferromagnetic phase of the noncentrosymmetric MnSi
摘要：
用小角中子非弹性散射测量研究了非中心对称二元化合物MnSi的场致铁磁相的磁振子色散关系。对于平行或反平行于外磁场传播的磁振子，我们实验证实色散关系沿磁场方向不对称移动。这种磁振子色散位移归因于相对论性的Dzyaloshinskiii-Moriya相互作用，该相互作用在非中心对称磁体中是有限的，例如MnSi。发现通过反转外部磁场方向可以切换移位方向。
英文摘要：
Small angle neutron inelastic scattering measurement has been performed to study the magnon dispersion relation in the field-induced-ferromagnetic phase of the noncentrosymmetric binary compound MnSi. For the magnons propagating parallel or anti-parallel to the external magnetic field, we experimentally confirmed that the dispersion relation is asymmetrically shifted along the magnetic field direction. This magnon dispersion shift is attributed to the relativistic Dzyaloshinskii-Moriya interaction, which is finite in noncentrosymmetric magnets, such as MnSi. The shift direction is found to be switchable by reversing the external magnetic field direction.
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