Atomic Magnetic State and Theory of X-Ray Spectroscopy in d and f Electron Systems

根据使用规则的总和，与磁循环失调的综合强度（MCD）光谱在核心到Valence X射线吸收和原子自旋和轨道磁性时刻，原子轨道时刻（M-D20-D2）在许多过渡金属多层中具有可测量的更广泛的扩展，并与用于散装系统的比较。We discuss the atomic environment dependence of M-D2 of various Co superlattices in Pd and Cu matixes on the basis of the tight-binding model including the d-d multiple interaction within the Hartree-Fock approximation In Pd matrix due to a large latice constant，M-D20エD2 of Co is increased to twice or so of the bulk value and it is rather insensitive to the atomic enment。In Cu matrix， on the other hand， since the effective Co-Cu3d hybridization is much smaller than the Co-Co one， MイD20イD2 of Co is found to be strongly dependent on the atomic environment and can be comparable to its spin counterpart.We discussed the relation between the“antiferManagement magnetic”Mn 3 d orbital ordering in LaMnLイD23イD2 and the linear dichroism in MnLイD2，3イD2，吸收从单离子模型的基础上提取到计算晶体场和内部多点相互作用。Although the recent resonant x-ray scManagement ing at Mn K edge is expected as a method of directly observing the orbital ordering there have been Management versies that it only observe the distortion of MnO·D26·D2 cluster。目前的研究显示，X射线吸收光谱中的多个结构可以发挥一个作用，作为指纹识别轨道排序的类型。

By using sum rules to relate the integrated intensity of magnetic circular dichroism (MCD) spectrum in core-to-valence x-ray absorption and the atomic spin and orbital magnetic moments, the atomic orbital moment (MィイD20ィエD2) has been measured extensively in many transition metal multilayers and has been compared with that for bulk systems. We discuss the atomic environment dependence of MィイD20ィエD2 of various Co superlattices in Pd and Cu matixes on the basis of the tight-binding model including the d-d multipole interaction within the Hartree-Fock approximation In Pd matrix due to a large lattice constant, MィイD20ィエD2 of Co is increased to twice or so of the bulk value and it is rather insensitive to the atomic environment. In Cu matrix, on the other hand, since the effective Co-Cu 3d hybridization is much smaller than the Co-Co one, MィイD20ィエD2 of Co is found to be strongly dependent on the atomic environment and can be comparable to its spin counterpart.We discussed the relation between the "antiferromagnetic" Mn 3d orbital ordering in LaMnOィイD23ィエD2 and the linear dichroism in MnLィイD22,3ィエD2, absorption on the basis of the single-ion model taking into account the crystal field and the intraatomic multipole interaction. Although the recent resonant x-ray scattering at Mn K edge is expected as a method of directly observing the orbital ordering there have been controversies that it only observe the distortion of MnOィイD26ィエD2 cluster. The present study shows that the multiplet structure in x-ray absorption spectrum can play a role as a fingerprint to identify the type of orbital ordering.