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Theoretical study of elastic and inelastic resonant x-ray scattering

弹性和非弹性共振X射线散射的理论研究

基本信息

批准号：
16540298
负责人：
IGARASHI Jun-ichi
金额：
$ 1.92万
依托单位：
Ibaraki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

We have studied the elastic and inelastic resonant x-ray scattering from the microscopic viewpoint, and have clarified their mechanism. Elastic scattering (RXS)Inelastic scattering (RIXS)1. We have analyzed the spectra at the superlattice spots of the Cr spin density wave in Cr K edge resonance on the basis of the ab initio band structure calculation. It has been clarified that the intensities arise from the orbital polarization of the 4p bands induced by the orbital polarization of the 3d states at neighboring Cr sites through the p-d hybridization. We have also analysed the spectra at the superlattice spots of Cr charge density wave in Cr L edge resonance. It has been predicted that strong intensities come out from the modulation in 3d states due to the SDW exchange potential.2. On the basis of the localized electron picture, we have derived general expressions relating the spectra to the multipole ordering for the dipole and quadrupole transitions. These formulas have been applied to analyze the actinide M_<4,5> Edge spectra in NpO_2 and Ce_<1-x>La_xB_6, having clarified the relation of the spectra and the octupole ordering.Inelastic scattering (RIXS)1. We have obtained a general formula of the inelastic scattering on the basis of the Keldysh Green function formalism. We have examined the validity of the Born approximation by analyzing the multiple scattering by the core-hole potential. We have applied this formula to the RIXS from La_2CuO_4, SrCuO_2, CuGeO_3, NiO. The calculated spectra have reproduced well the spectral shapes as a function of energy loss and their momentum dependence, having clarified the relation of the charge excitation and the spectra.2. We have formulated the two-magnon spectra in Heisenberg antiferromagnets. Having employed the 1/S-expansion (S is the magnitude of spin), we have analyzed the two-magnon RIXS spectra. This study has clarified the difference from the light scattering.

从微观角度研究了弹性和非弹性共振x射线散射，阐明了它们的机理。弹性散射（RXS）非弹性散射（RIXS）在从头计算能带结构的基础上，分析了Cr K边共振中Cr自旋密度波在超晶格点处的谱。已经澄清的是，通过p-d杂化，由相邻Cr位处的3d态的轨道极化引起的4p带的轨道极化引起的强度。我们还分析了Cr L边共振时Cr电荷密度波在超晶格点处的谱。由于SDW交换势的作用，3d态的调制将产生强的强度.在定域电子图象的基础上，我们导出了偶极和四极跃迁的谱与多极序关系的一般表达式。应用这些公式分析了NpO_2和Ce_ La_xB_6中锕系元素的M_（4，5）边谱，阐明了M_（4，5）<1-x>边谱与八极序的关系。本文在Keldysh绿色函数形式的基础上得到了非弹性散射的一般公式。通过分析核-空穴势的多重散射，我们检验了玻恩近似的有效性。我们把这个公式应用于La_2CuO_4，SrCuO_2，CuGeO_3，NiO的RIXS。计算得到的光谱很好地再现了能量损失和动量依赖关系下的光谱形状，阐明了电荷激发与光谱的关系.我们给出了海森堡反铁磁体中的双磁振子谱。采用1/S展开（S为自旋量），我们分析了双磁振子RIXS谱。本研究澄清了与光散射的区别。

项目成果

期刊论文数量（90）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Magnetic Resonant X-Ray Scattering at the Ga K Edge in UGa3 : a Band Theoretical Approach

UGa3 中 Ga K 边缘的磁共振 X 射线散射：能带理论方法

DOI：
发表时间：
2004
期刊：
Phys.Rev. B 69
影响因子：
0
作者：
M.Usuda;J.Igarashi;A.Kodama
通讯作者：
A.Kodama

「研究成果報告書概要(欧文)」より

摘自《研究结果报告摘要（欧洲）》

DOI：
发表时间：
2006
期刊：
Seibutsu Butsuri 46(1)
影响因子：
0
作者：
Yasushi Shigeri;Keiko Shimamoto
通讯作者：
Keiko Shimamoto

An Ab Initio Study on L-Edge X-Ray Resonant Scattering from Chromium in the Spin Density Wave State

自旋密度波态铬 L 边 X 射线共振散射的从头算研究

DOI：
发表时间：
2006
期刊：
J. Phys. Soc. Jpn. 75
影响因子：
0
作者：
T.Iida;H.Ishihara;Masaru Kato;M.Takahashi
通讯作者：
M.Takahashi

Resonant X-Ray Scattering from URu2Si2

URu2Si2 的共振 X 射线散射

DOI：
发表时间：
2005
期刊：
J.Phys.Soc.Jpn. 74
影响因子：
0
作者：
T.Nagao;J.Igarashi
通讯作者：
J.Igarashi

Theoretical Study on Resonant Inelastic X-Ray Scattering in Quasi-One-Dimensional Cuprates

准一维铜酸盐共振非弹性X射线散射的理论研究

DOI：
发表时间：
2004
期刊：
J. Phys. Soc. Jpn. 73・7
影响因子：
0
作者：
M.Machida;T.Koyama;S.Suga;M.Machida et al.;T.Nagao;T.Koyama;T.Nagao;Tomio Koyama;Tomio Koyama;Y.Nisikawa;Masahiko Machida;M.Usuda;平賀晴弘他;Masahiko Machida;Hideki Matsumoto;Masaru Kato;T.Koyama;M.Fujita et al.;Tomio Koyama;T.Nomura
通讯作者：
T.Nomura