Charge and Spin Ordering in Layered Perovskite-type Oxide Studied by Synchrotron X-ray Diffraction

通过同步加速器 X 射线衍射研究层状钙钛矿型氧化物中的电荷和自旋排序

• 批准号: 09440144
• 负责人: MURAKAMI Youichi
• 金额: $ 8.32万
• 依托单位: High Energy Accelerator Research Organization
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440144/
• 关键词: Strongly Correlated Electron System; Manganite; Charge Ordering; Orbital Ordering; Synchrotron Radiation; X-ray Diffraction; Resonant X-ray Scattering; Perovskite; X線共鳴散乱

Recently, it has been recognized that the charge, spin, and orbital degrees of freedom play important roles in the electric and magnetic properties of the transition-metal oxides. In perovskite-type manganited, especially, the discover of a wide variety of magnetic-field-induced phenomena, such as a colossal magnetoresistance and a magnetostructural transition, has stimulated much activity this field. The spin and charge ordering can be directly observed by neutron and electron diffraction, and some other techniques. The experimental technique to observe the orbital ordering, however, has been limited. Here, we have developed a resonant x-ray scattering technique to detect the orbital ordering directly.We have succeeded to observe many types of charge, spin, and orbital ordering states in perovskite oxides as well as a f-electron systems by using the resonant x-ray scattering. Recent great achievements are an observation of short-range ordering of charge and orbital and a observation of orbital-superlattice in an artificial lattice. The mechanism of the charge and orbital ordering has been elucidated by the observation of the short-range order. Meanwhile, it is expected that we can find a way of making electric devices with an artificial lattice by the observation of the orbital-superlattice.

最近，人们已经认识到，自由度的电荷，自旋和轨道程度在过渡金属氧化物的电和磁性中起着重要作用。尤其是在钙钛矿型曼彻斯特（Perovskite Type）中，发现各种磁场诱导的现象，例如巨大的磁磁性和磁结构过渡，刺激了这一领域的许多活性。可以通过中子和电子衍射以及其他一些技术直接观察到自旋和电荷顺序。但是，观察轨道排序的实验技术受到限制。在这里，我们开发了一种共振X射线散射技术来直接检测轨道排序。我们成功地观察了钙钛矿氧化物中的许多类型的电荷，自旋和轨道订购状态以及通过使用共振X射线散射的F-电子系统。最近的伟大成就是观察到电荷和轨道的短距离顺序，以及在人造晶格中观察到轨道刺的。电荷和轨道顺序的机制已通过观察短期顺序阐明。同时，预计我们可以通过观察轨道 - 苏植物的观察来找到一种用人工晶格制造电动设备的方法。

项目成果

村上洋一 他: "結晶解析ハンドブック第IV編第4章"共立出版株式会社. 673 (1999)

村上洋一等：《晶体分析手册第 IV 卷第 4 章》共立出版有限公司 673（1999）

M. V. Zinunermann et. al.: "INTERPLAY BETWEEN CHARGE, ORBITAL, AND MAGNETIC ORDER IN Pr_<1-x>Ca_xMnO_3"Phys. Rev. Lett.. 83. 4872-4875 (1999)

M.V. Zinunermann 等。

Y. Endoh et. al.: "TRANSITION BETWEEN TWO FERROMAGNETIC STATES DRIVEN BY ORBITAL ORDERING IN La_<0.88>Sr_<0.12>MnO_3"Phys. Rev. Lett.. 82. 4328-4331 (1999)

Y.Endoh 等。

村上洋一 他: "結晶解析ハンドブック"共立出版株式会社. 673 (1999)

村上洋一等：《晶体分析手册》共立出版673（1999）

Y.Murakami et al.: "RESONANT X-RAY SCATTERING FROM ORBITAL ORDERING IN LaMnOィイD23ィエD2."Phys. Rev. Lett.. 81. 582-585 (1998)

Y. Murakami 等人：“共振