Trial of synchrotron-radiation-based Mossbauer spectroscopy of Gd

Research Project

Project/Area Number	15K17490
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Quantum beam science
Research Institution	Kyoto University
Principal Investigator	Masuda Ryo 京都大学, 複合原子力科学研究所, 研究員 (50455292)
Research Collaborator	Yoshida Takefumi
Project Period (FY)	2015-04-01 – 2019-03-31
Project Status	Completed (Fiscal Year 2018)
Budget Amount *help	¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000) Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000) Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000) Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000) Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords	放射光 / メスバウアー分光 / ガドリニウム / ナノテクノロジー
Outline of Final Research Achievements	The possibility of synchrotron-radiation(SR)-based Mossbauer spectroscopy with gadolinium was studied. The　Mossbauer spectroscopy is an powerful method for the observation of electronic states of atoms, such as valence state and magnetic order, with very fine resolution smaller than one nanometer, since a specific nuclide is used as its probe. We developed a new measurement system for Gd SR-based Mossbauer spectroscopy with unique instruments such as multi-element detector for electronic scatterings. As a result, the counting rate of the system became 100 times higher than that of the similar measurement system in 2005 and we successfully obtained a SR-based Mossbauer spectrum of single molecular magnet including gadolinium. This measurement system is promising for the study of various functional materials including Gd by somewhat further development.
Academic Significance and Societal Importance of the Research Achievements	ナノテクノロジーの進展により、測定系についてもナノレベル分解能が求められている。ナノビームが一つの方向性として進められているが、同位体ラべリング法は生命反応の研究などで実績があり、かつ単原子レベルの分解能も実現可能な手法である。メスバウアー分光法はそのような同位体ラべリングが可能で、かつ高圧や反応気体中などさまざまな試料環境でも適用可能な物性研究法であり、磁性元素として知られるガドリニウムについて放射光で世界に先駆けてそれを実現することはナノ磁石等のナノ材料研究の進展に極めて有用である。