High-Pressure Magnetic Study of a Quasi Two-Dimensional pi-d Molecular Conductor

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K03526
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Shibaura Institute of Technology
• Principal Investigator: Ishii Yasuyuki 芝浦工業大学, 工学部, 教授 (90391854)
• Co-Investigator(Kenkyū-buntansha): 開 康一 福島県立医科大学, 医学部, 教授 (00306523)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 有機伝導体 / 金属絶縁体転移 / 磁性 / 圧力効果

Outline of Final Research Achievements

Magnetic measurements were carried out under high-pressure up to 0.15 GPa on the molecular pi-d system, lambda-BETS2FeCl4. Below 0.04 GPa, antiferromagnetic transition temperature decreased with increasing pressure. On the other hand, above 0.04 GPa, antiferromagnetic transition temperature is almost unchanged. Assuming that most of the magnetism observed in this experiment is contributed from the d-electrons of iron, it is considered that the contribution of pi-electrons is dominant below 0.04 GPa, while the antiferromagnetic state coming from d-electrons still remains above 0.04 GPa.

Free Research Field

高圧物性

Academic Significance and Societal Importance of the Research Achievements

本研究成果はπ電子とd電子が共存する強相関電子系物質において，これまでわかっていなかった金属絶縁体転移と磁気転移の機構を解明するための鍵となる成果である。社会的意義としては，金属絶縁体転移を磁場と圧力でコントロールしていることから，次世代のスイッチ素子としての応用の鍵となる可能性も内在している。