2021 Fiscal Year Final Research Report
Investigation of Novel Electronic States Induced by Asymmetric Dimer Structures
| Project/Area Number |
19K14641
|
|---|
| Research Category |
Grant-in-Aid for Early-Career Scientists
|
| Allocation Type | Multi-year Fund |
|---|
| Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
|
|---|
| Research Institution | Hokkaido University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2019-04-01 – 2022-03-31
|
| Keywords | 誘電性 / 磁性 / 核磁気共鳴 / 熱測定 / 分子性固体 |
|---|
| Outline of Final Research Achievements |
In this study, we aimed to explore novel electronic phases and dielectric responses that are caused by the charge degrees of freedom in the dimer. We found that λ-(BEDT-STF)2GaCl4 and λ-(BEDT-STF)2FeCl4 exhibit relaxor-like behavior caused by the charge degrees of freedom in the dimer. We performed the Nuclear Magnetic Resonance (NMR), heat capacity, dielectricity, Mossbauer, and μSR measurements for λ-type BEDT-STF salts. We obtained important insights into the unconventional magnetic ground state of λ-(BEDT-STF)2GaCl4 and the origin of the unconventional magnetic states that emerge in λ-(BEDT-STF)2FeCl4 and λ-(BEDT-STF)2FexGa1-xCl4.
|
| Free Research Field |
物性物理学
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究では電荷の濃淡という新たな電荷自由度が生み出す新奇物性、機能性の探索と解明を目指した。結果として、対象物質が電荷の濃淡に起因するリラクサー的挙動を示すことを見出した。また、対象物質の特異な磁気的性質の解明に繋がる重要な知見を得た。電荷の濃淡による誘電現象は、電気分極が変化する際に、変化するのは電荷の濃淡のみで従来物質のような格子変位を伴わないことから、例えば光による高速スイッチングが可能な高度機能材料への応用が期待されており、本研究成果が新材料開発の足掛かりとなることを期待している。
|
