Verification of a possibility for valence fluctuation in uranium compounds probed by high-resolution x-ray spectroscopy under multiple extreme conditions

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05195
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Kawamura Naomi 公益財団法人高輝度光科学研究センター, 利用研究促進部門, 主幹研究員 (40393318)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: ウラン化合物 / 量子臨界現象 / 価数ゆらぎ / X線発光分光 / X線吸収分光 / ウラン価数

Outline of Final Research Achievements

To understand exotic physical properties in uranium compounds derived by 5f electrons from a viewpoint of uranium valence states, high-energy resolution x-ray absorption spectroscopy was performed under low temperature, high magnetic field, and high pressure. A uranium compound, whose uranium valence states vary with temperature and pressure, was found for the first time, while there is little change in the valence states for most of uranium compounds. To clarify a factor of the valence variation, it is necessary to investigate the correlation with physical properties in near future. However, establishment of the method to precisely investigate valence states for the materials in 5f-electron system would advance understanding with interesting physics in f-electron systems.

Free Research Field

X線分光，磁性