Inner-shell spectroscopy study on strongly correlated electron systems at 50-Tesla high magnetic fields

50特斯拉强磁场下强相关电子系统的内壳光谱研究

• 批准号: 17340111
• 负责人: MATSUDA Yasuhiro
• 金额: $ 6.52万
• 依托单位: Tohoku University (2006-2007)Okayama University (2005)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340111/
• 关键词: high magnetic fields; X-ray spectroscopy; valence fluctuation; strongly correlated electron systems; X-ray magnetic circular dichroism; パルス強磁場; 磁場誘起相転移; 内殻分光; メタ磁性; XMCD; X線吸収; 価数転移; 近藤半導体

Experimental techniques for the inner-shell magneto-spectroscopy using synchrotron X-rays and pulsed high magnetic fields in the, range of 50 T were developed. We studied rare-earth based strongly correlated materials such as YbInCu_4 and EuNi_2(Si_<1-X>,Ge_X)_2. These materials show significant valence fluctuation at low temperature. Interplay between conduction electrons and localized electrons in matter has been attracting considerable attention because it is one of the most important issues to understand exotic phenomena such as high-T_c superconductivity and the heavy fermions in the so-called strongly correlated electron systems. Valence fluctuation in rare-earth intermetallics is an interesting phenomenon for investigation of the interplay between the conduction electrons and localized f-electrons. The valence states of the rare-earth ions such as Yb and Eu are directly determined in high fields for the first time. As the next step, the experiment of the X-ray magnetic circular dichroism has been performed. The characteristic features due to the significant hybridization in the matter were observed at the spectra in high magnetic fields. These findings are useful for deeper understanding of interplay between conduction and localized electrons.

开发了使用同步加速器X射线和脉冲高磁场在50 t范围内的内壳磁光谱的实验技术。我们研究了基于稀土的强相关材料，例如ybincu_4和euni_2（si_ <1-x>，ge_x）_2。这些材料在低温下显示出显着的价波动。传导电子与物质局部电子之间的相互作用吸引了大量关注，因为它是理解外来现象的最重要问题之一，例如高-T_C超导性和所谓强烈相关的电子系统中的重量。稀土金属层中的价波动是研究传导电子与局部F-电子之间相互作用的有趣现象。首次在高场中直接确定稀土离子（例如YB和欧盟）的价状态。作为下一步，已经进行了X射线磁圆二色性的实验。在高磁场的光谱上观察到了由于物质中显着的杂交引起的特征。这些发现对于更深入地了解传导和局部电子之间的相互作用很有用。

项目成果

Eu価数揺動物質のパルス強磁場XMCD

Eu价振荡材料的脉冲强磁场XMCD

• 发表时间: 2008
• 作者: H. Tsunetsugu;他;G.q.Zheng;野尻浩之
• 通讯作者: 野尻浩之

ポータブル型パルス磁場による強磁場下での放射光X線回折実験

使用便携式脉冲磁场进行强磁场同步辐射X射线衍射实验

• 发表时间: 2005
• 作者: 松田康弘;稲見俊哉;大和田謙二;野尻浩之
• 通讯作者: 野尻浩之

強磁性形状記憶合金Fe_3Ptのパルス磁場中時分解X線回折

脉冲磁场中铁磁形状记忆合金Fe_3Pt的时间分辨X射线衍射

• 发表时间: 2006
• 作者: 村田悠人;他
• 通讯作者: 他

強磁性形状記憶合金の磁場中時分解X線回折

铁磁形状记忆合金磁场中时间分辨X射线衍射

• 发表时间: 2006
• 作者: 松田康弘;他
• 通讯作者: 他

固体物理

固体物理

• 发表时间: 2008
• 作者: 岩佐和晃;桑原慶太郎;神木正史
• 通讯作者: 神木正史