稀土正铁氧体HoFeO $_3$的中子非弹性散射研究
Neutron inelastic scattering study of rare-earth orthoferrite HoFeO$_3$
摘要：
用单晶非弹性中子散射研究了正铁氧体HoFeO_3。我们表明，铁子系统的自旋动力学不改变通过自旋重取向转变。在线性自旋波理论框架下分析了观测到的磁激发谱。在这种方法下，得到了Fe子系统的最近邻和次最近邻的反铁磁交换相互作用。在Fe子系统的Dzyaloshinskiii-Moriya相互作用的参数进行了改进。Fe自旋波能隙随温度的变化反映了各向异性参数随温度的变化。并对Fe-Ho和Ho-Ho交换相互作用值进行了估算。
英文摘要：
By the single crystal inelastic neutron scattering the orthoferrite HoFeO3 was studied. We show that the spin dynamics of the Fe subsystem does not change through the spin-reorientation transitions. The observed spectrum of magnetic excitations was analyzed in the frames of linear spin-wave theory. Within this approach the antiferromagnetic exchange interactions of nearest neighbors and next nearest neighbors were obtained for Fe subsystem. Parameters of Dzyaloshinskii-Moriya interactions at Fe subsystem were refined. The temperature dependence of the gap in Fe spin-wave spectrum indicates the temperature evolution of the anisotropy parameters. The estimations for the values of Fe-Ho and Ho-Ho exchange interaction were made as well.
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