论文标题
手性Ferrimagnet $ \ text {cu} _2 \ text {oseo} _3 $：一种粗粒的方法
Low energy magnons in the chiral ferrimagnet $\text{Cu}_2\text{OSeO}_3$: a coarse-grained approach
论文作者
论文摘要
我们报告了呼吸pyrochlore helimagnetic $ \ text {cu} _2 \ text {oseo} _3 $中的低能磁激励的全面中子散射研究。 Fully documenting the four lowest energy magnetic modes that leave the ferrimagnetic configuration of the "strong tetrahedra" intact ($|\hbarω|<13$ meV), we find gapless quadratic dispersion at the $Γ$ point for energies above 0.2 meV, two doublets separated by 1.6(2) meV at the $R$ point, and a bounded continuum at the $X$ point.我们约束的刚性旋转簇模型将这些特征与dzyaloshinskii-moriya（DM）相互作用和不相称的螺旋基态相关联。将常规的自旋波理论与自旋簇组合形式结合，可以通过多个布里渊区精确地重现所测量的相等时间结构因子。获得了一种有效的自旋汉密尔顿，描述了复杂的各向异性群体间相互作用。
We report a comprehensive neutron scattering study of low energy magnetic excitations in the breathing pyrochlore helimagnetic $\text{Cu}_2\text{OSeO}_3$. Fully documenting the four lowest energy magnetic modes that leave the ferrimagnetic configuration of the "strong tetrahedra" intact ($|\hbarω|<13$ meV), we find gapless quadratic dispersion at the $Γ$ point for energies above 0.2 meV, two doublets separated by 1.6(2) meV at the $R$ point, and a bounded continuum at the $X$ point. Our constrained rigid spin cluster model relates these features to Dzyaloshinskii-Moriya (DM) interactions and the incommensurate helical ground state. Combining conventional spin wave theory with a spin cluster form-factor accurately reproduces the measured equal time structure factor through multiple Brillouin zones. An effective spin Hamiltonian describing the complex anisotropic inter-cluster interactions is obtained.
