BAND THEORETICAL INTERPRETATION OF NEUTRON DIFFRACTION PHENOMENA IN FERROMAGNETIC METALS
BAND THEORETICAL INTERPRETATION OF NEUTRON DIFFRACTION PHENOMENA IN FERROMAGNETIC METALS
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DOI：
10.1143/jpsj.18.1025
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发表时间：
1963-01-01
影响因子：
1.7
通讯作者：
KUBO, R
中科院分区：
文献类型：
--
作者：
IZUYAMA, T;KIM, DJ;KUBO, R
尽管铁磁过渡金属中的中子衍射现象已经成功地用局域自旋模型来处理，但这可能不能被视为这种模型独特有效性的证明。如果通过梯近似考虑电子的相关效应，则巡回电子模型能够同样很好地解释观察到的衍射。通过简单的假设计算了复杂的动力学磁化率，并利用涨落耗散定理得到了自旋密度的时空相关函数。从相关函数得出的中子散射截面解释了 Tc 以下的磁漫散射、Tc 周围的磁临界散射以及 Tc 以上的顺磁散射。现有数据不足以区分本地模型和流动模型。
Although the neutron diffraction phenomena in ferromagnetic transition metals have been successfully treated in terms of the localized spin model, this may not be regarded as a proof of the unique validity of such a model. If the correlation effect of electrons is taken into consideration by a ladder approximation, the itinerant electron model is shown to be capable of accounting for the observed diffraction equally well. The complex dynamical susceptibility is calculated with simple assumptions and the space-time correlation function of spin density is obtained from it by means of the fluctuation-dissipation theorem. The cross-section for neutron scattering derived from the correlation function explains the magnetic diffuse scattering belowTc, the magnetic critical scattering aroundTcand the paramagnetic scattering aboveTc. Existing data are not enough in order to discriminate between the localized and itinerant models.