The study on observation technique of orbital orderingby synchrotron radiation, neutron, and electron beams.

同步辐射、中子、电子束轨道有序观测技术研究。

• 批准号: 12304019
• 负责人: MURAKAMI Youichi
• 金额: $ 29.79万
• 依托单位: TOHOKU UNIVERSITY (2001-2002)The High Energy Accelerator Research Organization (2000)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12304019/
• 关键词: Orbital Orderin; Charge Ordering; Quadrupole Ordering; Transition Metal Oxide; Rare Earth Compound; Resonant X-ray Scattering; Magnetic Compton Scattering; Orbital Fluctuation; 軌道秩序

Three degrees of freedom (charge, spin, and orbital) play very important roles in the electronic and magnetic properties in strongly correlated electron systems. Therefore, it is necessary to observe the ordering states of the degrees of freedom. However, the experimental technique to observe the orbital ordering has been very limited compared with the charge and spin ordering. The aim of this study is to develop thetechnique using synchrotron X rays, neutrons, and electron beams.We make five groups to achieve the aim. The followings are the main results for the groups.1. Samples and the evaluations group: We have made good quality samples of transition metal oxides and f-electron systems.2. Synchrotron X rays group: We have developed a new technique to observe ferro-orbital ordering -using the interference of resonant X-ray scattering. Magnetic Compton profile has revealed the orbital state of layered manganites.3. Neutrons group: The polarized neutron diffraction has elucidated the orbital state of layered manganites coupled with the powder neutron iffraction.4. Electron beams group: We have developed the software-of the convergent electron diffraction and made clear the orbital state of the manganite.5. Theory group: We have constructed the general theory of resonant X-ray scattering to observe the orbital ordering and its fluctuation

三个自由度（电荷，自旋和轨道）在强相关的电子系统中在电子和磁性中起着非常重要的作用。因此，有必要观察自由度的排序状态。但是，与电荷和旋转顺序相比，观察轨道顺序的实验技术非常有限。这项研究的目的是使用Synchrotron X射线，中子和电子束开发thetechnique。我们将五个组实现目标。以下是组的主要结果1。样品和评估组：我们为过渡金属氧化物和F-电子系统做了高质量的样本。2。 Synchrotron X Rays组：我们开发了一种新技术来观察铁轨道排序 - 使用谐振X射线散射的干扰。磁性康普顿曲线揭示了分层锰矿的轨道状态3。中子组：极化的中子衍射已经阐明了层状锰的轨道状态以及粉末中子iffraction.4。电子束组：我们已经开发了收敛电子衍射的软件，并清除了锰矿的轨道状态5。理论小组：我们构建了谐振X射线散射的一般理论，以观察轨道顺序及其波动

项目成果

H.Sawa, Y.Murakami et al.: "Low-Temperature Structure of the Quarter-Filled Ladder Compoimd a'-NaV_2O_5"J.Phys.Soc.Jpn.. 71. 385-388 (2002)

H.Sawa, Y.Murakami 等：“四分之一填充梯状化合物 a-NaV_2O_5 的低温结构”J.Phys.Soc.Jpn.. 71. 385-388 (2002)

Sumio Ishihara: "Magnetic Ordering, Orbital Ordering and Resonant X-ray Scattering in Perovskite Titanates"Phys.Rev B. 65. 064442-1-064442-9 (2002)

Sumio Ishihara：“钙钛矿钛酸盐中的磁有序、轨道有序和共振 X 射线散射”Phys.Rev B. 65. 064442-1-064442-9 (2002)

Y.Moritomo et al.: "Pressure-Induced Insulator-Metal Transition in a Bilayer Manganite : Pressure Control of Orbital Stability"Phys.Rev.B. 62. 17-20 (2000)

Y.Moritomo 等人：“双层锰氧化物中的压力诱导绝缘体-金属转变：轨道稳定性的压力控制”Phys.Rev.B。

Osamu Shimomura, Junichiro Mizuki, Hiroshi Sawa, Youichi Murakami: "Invitation to Experiments of Structural Materials Science using Synchrotron X-rays"Solid State Physics. 37. 711-725 (2002)

Osamu Shimomura、Junichiro Mizuki、Hiroshi Sawa、Youichi Murakami：“邀请使用同步加速器 X 射线进行结构材料科学实验”固体物理。

K.Ohwada et al.: ""Devil's Staircase"-Type Phase Transition in NaV_2O_5 under High Pressure"Phys.Rev.Lett.. 87. 0864002-1-086402-4 (2001)

K.Ohwada 等：“高压下 NaV_2O_5 中的“魔鬼阶梯”型相变”Phys.Rev.Lett.. 87. 0864002-1-086402-4 (2001)