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.

发展了同步辐射X射线和50 T脉冲强磁场内壳层磁谱的实验技术。我们研究了稀土基强关联材料YbInCu_4和EuNi_2（Si_<1-X>，Ge_X）_2。这些材料在低温下表现出明显的价态涨落。传导电子与局域电子之间的相互作用是理解高T_c超导和强关联电子系统中重费米子等奇异现象的重要问题之一，因而引起了人们的广泛关注。稀土金属间化合物中的价态涨落是研究传导电子与定域f电子相互作用的一个有趣现象。首次在高场条件下直接测定了Yb、Eu等稀土离子的价态。作为下一步，进行了X射线磁性圆二色性实验。在高磁场下的光谱中观察到了由于物质中的显著杂化而产生的特征。这些发现有助于更深入地理解导电和局域电子之间的相互作用。

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

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

High Magnetic Field X-ray Spectroscopy Using a Miniature Pulsed-magnet: A new tool of in vestigating electronic states in high magnetic fields

使用微型脉冲磁体的高磁场 X 射线光谱：研究高磁场中电子态的新工具

• 发表时间: 2007
• 期刊: SOLID STATE PHYSICS 42
• 作者: Y. H. Matsuda;T. Inami;K. Ohwada;H. Nojiri
• 通讯作者: H. Nojiri