Spin Freezing Crossover and Cooper Pairing Symmetry in the Organic Strange Metal kappa-(ET)4Hg2.89Br8 and kappa-(ET)4Hg2.78Cl8
Project/Area Number |
21K13885
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
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Research Institution | Shibaura Institute of Technology |
Principal Investigator |
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Project Period (FY) |
2021-04-01 – 2025-03-31
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Project Status |
Granted (Fiscal Year 2022)
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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)
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Keywords | Penetration depth / Knight shift / strange metal / non-Fermi liquid / Cooper pair / Strange metal / Spin freezing / SYK model / Hubbard model / Non-Fermi liquid / 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.
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Outline of Annual Research Achievements |
In this year we have performed Transverse-field muSR experiment on k-HgBr for the first time (in the perpendicular mode) obtaining in-plane penetration depth order parameter. The additional measurement is necessary to improve signal-noise ratio. We got our following muSR proposal approved and plan to add the sample mass. In the k-HgCl Zero-field muSR measurement also has been done in k-HgCl down to 25 miliK for the first time. There is no obvious signature of long-range ordered. Furthermore, we have developed a technique to measure dc-susceptibility for this series samples (plate-like shape crystal) to get a precise temperature dependence of susceptibility. We aim to report the plot of muon Knight shift vs susceptibility, comparing between those in k-HgBr and k-HgCl.
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Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The penetration depth measurement needs to be improved to get solid and complete data set, although we earned the high-priority muSR beamtime at TRIUMF Canada from the proposal submission in January 2023.
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Strategy for Future Research Activity |
2023: We will perform Transverse-field muSR at TRIUMF in k-HgBr. The measurement at ISIS and JPARC is slightly shifted to 2024.
2024: Writing up main papers and execute a continuation.
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Report
(2 results)
Research Products
(10 results)
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[Presentation] Superconductivity Nearby Quantum Critical Point in Hole-Doped Organic Strange Metal -(ET)4Hg3-Br82022
Author(s)
D. P. Sari, Y. Cai, U. Widyaiswari, E. Yamada, M-V. deToro Sanchez, Y. Someya, A. Koda, K. M. Kojima, I. Watanabe, Y. Ishii, and H. Taniguchi
Organizer
The 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (muSR conference 2020)
Related Report
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[Presentation] μ+SR Study of κ-(ET)4Hg3-δBr8 (δ=0.11) and κ-(ET)4Hg3-δCl8 (δ=0.22) Part II2022
Author(s)
D. P. Sari, Y. Cai, U. Widyaiswari, E. Yamada, M-V. deToro Sanchez, Y. Someya, A. Koda, K. M. Kojima, I. Watanabe, Y. Ishii, and H. Taniguchi
Organizer
JPS Autumn Meeting 2022
Related Report
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