用非弹性中子散射研究MnSi中螺旋磁子的能带结构
Band structure of helimagnons in MnSi resolved by inelastic neutron scattering
摘要：
磁性螺旋线实现具有由节距长度$λ_h$给出的周期的一维磁性晶体。它的自旋波激发--helimagnons --经历布拉格散射，偏离该周期性，导致光谱中出现间隙，抑制它们沿节距方向的传播。利用高分辨非弹性中子散射，通过在单个磁螺旋畴中制备MnSi单晶，解决了螺旋磁子的能带结构。至少有五个helimagnon带可以被确定，覆盖交叉从平坦的带在低能量helimagnons基本上沿着间距方向定位到分散带在较高的能量。在低能量的限制，我们发现的helmagnon频谱是由一个普遍的，无参数的理论。考虑到这种低能量理论的修正，在整个能量范围内获得定量的协议研究的帮助下，一个单一的拟合参数。
英文摘要：
A magnetic helix realizes a one-dimensional magnetic crystal with a period given by the pitch length $λ_h$. Its spin-wave excitations -- the helimagnons -- experience Bragg scattering off this periodicity leading to gaps in the spectrum that inhibit their propagation along the pitch direction. Using high-resolution inelastic neutron scattering the resulting band structure of helimagnons was resolved by preparing a single crystal of MnSi in a single magnetic-helix domain. At least five helimagnon bands could be identified that cover the crossover from flat bands at low energies with helimagnons basically localized along the pitch direction to dispersing bands at higher energies. In the low-energy limit, we find the helimagnon spectrum to be determined by a universal, parameter-free theory. Taking into account corrections to this low-energy theory, quantitative agreement is obtained in the entire energy range studied with the help of a single fitting parameter.
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