The role of Coulomb interaction between 4f-conduction electrons in strongly correlated 4f-electrons system for quantum criticality

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03697
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Mizumaki Masaichiro 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 (60360830)
• Co-Investigator(Kenkyū-buntansha): 筒井 智嗣 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 (70360823) ; 池永 英司 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, 研究員 (90443548)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 量子臨界現象 / 価数評価 / 共鳴光電子分光 / X線発光分光

Outline of Final Research Achievements

We quantitatively analyze 4f electron number and 4f electron conduction (5d) electron coulomb interaction which is an important physical parameter in the quantum critical phenomenon originating from valence fluctuation by X-ray absorption spectroscopy and resonant X-ray photoelectron spectroscopy evaluated. The magnitude of the Coulomb interaction in YbRh2Si2, which is considered to be near the quantum critical point, was about 2 eV, and the 4 f electron number was 13.85. This result supported the theoretical research results. Resonance photoelectron spectroscopy in the hard X-ray region was established by this subject.

Free Research Field

X線分光