| Project/Area Number |
21K13885
|
|---|
| 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 | Shibaura Institute of Technology |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2021-04-01 – 2025-03-31
|
| Project Status |
Completed (Fiscal Year 2024)
|
| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2024: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
|
|---|
| Keywords | Hole doped / organic superconductor / Mott insulator / penetration depth / spin freezing / spin diffusion / spin dynamics / spin entanglement / Cooper Pairing Symmetry / Spin Diffusion / Spin Freezing / SYK model / Non-Fermi liquid / Penetration depth / Knight shift / Cooper pair / Strange metal / Spin freezing / Quantum entanglement / strange metal / non-Fermi liquid / Hubbard model / QCP / AdS/CFT correspondence |
|---|
| Outline of Research at the Start |
The spin freezing crossover observed as a highly fluctuating spin in the metallic state and the Cooper pairing symmetry of two strange metal candidates known as a triangular lattice single-band Hubbard model system, k-(ET)4Hg2.89Br8 and k-(ET)4Hg2.78Cl8, will be studied by muon-spin relaxation.
|
| Outline of Final Research Achievements |
We find a piece of evidence of a spin-frozen crossover in hole-doped organic conductor k-(ET)4Hg2.78Cl8 using highly sensitive zero-field and high-field muon spectroscopy. A similar metallic state may give rise to an unconventional superconducting state in the sister compound k-(ET)4Hg2.89Br8, whose penetration depth is confirmed to be more than 1000 micrometers by muon spectroscopy. k-(ET)4Hg2.78Cl8 may be a Mott insulator with a magnetic lattice, unlike the isotropic triangular lattice k-(ET)4Hg2.89Br8, which transitions to a square lattice with similar exchange interactions at about 130 K.
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究成果の科学的・社会的意義の一つは、正孔ドープ有機伝導体k-(ET)4Hg2.78Cl8の磁気特性が、等方性三角格子を持つk-(ET)4Hg2.89Br8とはわずかに異なることを報告したことです。バルク磁化率測定から、前者は三角格子と正方格子の中間的な格子構造をとることがわかりました。この研究成果はResearchmapで120回以上ダウンロードされています。さらに、本研究によって、無機固体と有機固体の物理を橋渡しするこの非常に希少な化合物の合成を継続しており、おそらく世界でこの結晶を積極的に生産しているのは当グループだけでしょう。
|
