Theory of Resonant X-ray Emission Spectra in f and Electron Systems

f 和电子系统中的共振 X 射线发射光谱理论

• 批准号: 10640299
• 负责人: KOTANI Akio
• 金额: $ 2.24万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640299/
• 关键词: spectroscopy; rare-earth compounds; transtion-metal compounds; cluster model; polarization-dependence; charge transfer; electron correlation; magnetic circular dichroism; 共鳴X線発光; 干渉効果; 電気四重極子励起; 配置間相互作用; 内殻正孔; 遍歴性; 局在性; 円偏光二色性

Among the magnetic materials known so far, CeSb has the most complex phase diagram as a function of temperature and magnetic field. The complex magnetic phase diagram is know as the devil's staircase. Generally, the series of CeX (X=P, As, Bi, Sb) have complex magnetic phase diagrams in different degree, which suggests that there is a common mechanism for the devil's staircase observed in CeX. A characteristic feature of CeX is smallness of carriers. The carriers of CeX consist of holes at the Γ point and electrons at the X points. Under this situation, a new type of scattering processes from holes to electrons and vice versa accompanied by spin exchange with f-spins. This process may be called off-diagonal exchange in contrast to the usual exchanges where the scattering are within a band. The momentum transfer associated with his off-diagonal exchange corresponds to the antiferromagnetic wave vector, favoring antiferromagnetic RKKY interaction among the f spins. On the other hand, the ordinary exchanges favor ferromagnetic coupling in the low carrier limit. In this project, we have shown that the frustration between the RKKY interactions originated from these two types of exchange mechanisms is the basic mechanism for the devil's staircase in CeX by using a simple/

在迄今为止已知的磁性材料中，CeSb具有作为温度和磁场的函数的最复杂的相图。复杂的磁相图被称为魔鬼的楼梯。CeX（X=P，As，Bi，Sb）系列化合物的磁相图都有不同程度的复杂性，这表明CeX中出现魔鬼阶梯的机理是一致的。CeX的一个特征是载流子的小。CeX的载流子由位于Γ点的空穴和位于X点的电子组成。在这种情况下，一种新的类型的散射过程，从空穴到电子，反之亦然，伴随着自旋交换与f-自旋。这个过程可以被称为非对角交换，与散射在一个频带内的通常交换相反。与他的非对角交换相关的动量转移对应于反铁磁波矢量，有利于f自旋之间的反铁磁RKKY相互作用。另一方面，普通交换有利于铁磁耦合在低载流子限制。在这个项目中，我们已经证明，RKKY相互作用之间的挫折起源于这两种类型的交换机制是魔鬼的楼梯在CeX中的基本机制，通过使用一个简单的/

项目成果

M. Matsubara: "Polarization Dependence of Resonant X-Ray Emission Spectra in Early Transition Metal Compounds"J. Phys. Soc. Jpn.. 69. 1558-1565 (2000)

M. Matsubara：“早期过渡金属化合物中共振 X 射线发射光谱的偏振依赖性”J。

A. Kotani: "Resonant Inelastic X-Ray Scattering Spectra for Electrons in Solids"Rev. Mod. Phys.. 73. 203-246 (2001)

A. Kotani：“固体中电子的共振非弹性 X 射线散射光谱”Rev。

T.Uozumi: "Theoretical and experimental study of surface and bulk contributions in resonant inverse photoemission of CeRh_3"Physical Review B. 65. 045105-1-10 (2002)

T.Uozumi：“CeRh_3 谐振逆光电发射中表面和体贡献的理论和实验研究”物理评论 B. 65. 045105-1-10 (2002)

Akio Kotani: "Theory of X-ray emission spectra in f and d electron systems" Journal of Electron Spectroscopy and Related Phenomena. 92. 171-179 (1998)

Akio Kotani：“f 和 d 电子系统中的 X 射线发射光谱理论”《电子能谱和相关现象杂志》。

A.Kotani: "Theoretical Study of Resonant X-Ray Emission in f and d Electron Systems-Impurity Anderson Model and Effects of Translational Symmetry-"J. Phys. Chem. Solids. 61. 419-424 (2000)

A.Kotani：“f和d电子系统中共振X射线发射的理论研究-杂质安德森模型和平移对称性的影响-”J。