2021 Fiscal Year Research-status Report
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 Institution | Shibaura Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2025-03-31
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| Keywords | Cooper pair / Strange metal / Spin freezing / SYK model / Hubbard model / Non-Fermi liquid / QCP / AdS/CFT correspondence |
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| Outline of Annual Research Achievements |
The 200 mg of superconducting k-[ET]4Hg2.89Br8 [k-HgBr] and Mott-insulating k-[ET]4Hg2.78Cl8 (k-HgCl) crystals are synthesized and aligned for the zero (ZF), transverse (TF), and longitudinal-field (LF) muSR experiments. In the k-HgBr, ZF-muSR down to 0.3 K suggest no time-reversal symmetry breaking in the superconducting state while LF and TF muSR for determining the Cooper pairing symmetry, have not been performed.
In the k-HgCl, the muon Knight shift measurement by the high-TF-muSR has been done for the first time in the world. Susceptibility dependence of the shift showed a non-linearity below 100 K occurring at a higher temperature than that in k-HgBr.
We aim to finalize the series of muSR experiments for both samples by the end of next fiscal year.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We earned the high-priority muSR beamtime at TRIUMF Canada from the proposal submission in June 2021 and January 2022.
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| Strategy for Future Research Activity |
2022: We will perform Zero-field and Transverse-field muSR experiment on k-(ET)4Hg2.89Br8 and k-(ET)4Hg2.78Cl8 using dilution refrigerator at TRIUMF Canada.
2023: We will perform Zero-field and Laongitudinal-field muSR experiment on k-(ET)4Hg2.89Br8 and k-(ET)4Hg2.78Cl8 at ISIS and JPARC, and finalize the analysis process.
2024: Writing up the papers.
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| Causes of Carryover |
none
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