Spin Freezing Crossover and Cooper Pairing Symmetry in the Organic Strange Metal kappa-(ET)4Hg2.89Br8 and kappa-(ET)4Hg2.78Cl8

2023 Fiscal Year Research-status Report

• Project/Area Number: 21K13885
• Research Institution: Shibaura Institute of Technology
• Principal Investigator: Dita PuspitaSari 芝浦工業大学, 工学部, 助教 (00821919)
• Project Period (FY): 2021-04-01 – 2025-03-31
• Keywords: Non-Fermi liquid / Penetration depth / Knight shift / Cooper pair / Strange metal / Spin freezing / Quantum entanglement

Outline of Annual Research Achievements

We synthesized more samples twice the weight of last year sample of k-HgBr and k-HgCl to improve the signal-to-noise ratio. We performed transverse field muSR on k-HgBr sample for the penetration depth measurement in the parallel and perpendicular mode. The muSR measurement on k-HgCl for the spin diffusion measurement down to dilution-refrigerator temperature is continued.

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 an overview summary is being written up.
The spin diffusion measurement down to dilution-refrigerator temperature will be conducted in December 2024.

Strategy for Future Research Activity

2024: Writing up main papers and execute a continuation. A related project fund has been proposed and applied.

Research Products

• [Int'l Joint Research] ISIS Neutron and Muon Source(英国)
  • Country Name: UNITED KINGDOM
  • Counterpart Institution: ISIS Neutron and Muon Source
• [Int'l Joint Research] TRIUMF(カナダ)
  • Country Name: CANADA
  • Counterpart Institution: TRIUMF
• [Journal Article] Pressure effect in the metallic state of λ-(BETS)2GaCl4 (2024)
  • Author(s): Ueno Masaki、Tsutsumi Asako、Katsuoka Naoto、Sari Dita Puspita、Suzuki Takao、Ishii Yasuyuki
  • Journal Title: Interactions Volume: 245 Pages: 71
  • DOI: 10.1007/s10751-024-01909-x
• [Journal Article] Magnetic Susceptibility Study of Hole-Doped Organic Metal κ-(ET)<sub>4</sub>Hg<sub>3-δ</sub>Cl<sub>8, </sub>δ=22% and κ-(ET)<sub>4</sub>Hg<sub>3-δ</sub>Br<sub>8, </sub>δ=11% (2023)
  • Author(s): Sari Dita Puspita、Widyaiswari Utami、Someya Yuta、Yamada Eiki、Taniguchi Hiromi、Watanabe Isao、Ishii Yasuyuki
  • Journal Title: Solid State Phenomena Volume: 345 Pages: 47～52
  • DOI: 10.4028/p-1xerwq
• [Presentation] μSR Study of Hole-Doped Organic Metals: Superconductivity Nearby Quantum Spin Liquid States (2023)
  • Author(s): D. P. Sari, Y. Cai, U. Widyaiswari, A. E. Putri, E. Yamada, Y. Someya, A. Koda, Y. Ishii, F. L. Pratt, I. Watanabe, K. M. Kojima, and H. Taniguchi
  • Organizer: Universiti Sains Malaysia (USM-RIKEN) International Conference on Advanced Sciences, Penang 2024
  • Int'l Joint Research / Invited
• [Presentation] Organic Superconductivity Nearby Quantum Criticality of a Magnetic Frustration (2023)
  • Author(s): D. P. Sari, Y. Cai, U. Widyaiswari, A. E. Putri, E. Yamada, Y. Someya, A. Koda, Y. Ishii, F. L. Pratt, I. Watanabe, K. M. Kojima, and H. Taniguchi
  • Organizer: The 1st Conference of Accelerator -Based Sciences and Technology CAST 2024, Jakarta 2024
  • Int'l Joint Research / Invited
• [Presentation] Introduction to the Muon Technique and Science (2023)
  • Author(s): D. P. Sari
  • Organizer: ISIS Indonesia and Malaysia Webinar I Introduction to ISIS Neutron & Muon Source, ONLINE
  • Int'l Joint Research / Invited
• [Presentation] μSR Study of Hole-Doped Organic Metals: Superconductivity Nearby Quantum Spin Liquid States (2023)
  • Author(s): D. P. Sari, Y. Cai, U. Widyaiswari, A. E. Putri, E. Yamada, Y. Someya, A. Koda, Y. Ishii, F. L. Pratt, I. Watanabe, K. M. Kojima, and H. Taniguchi
  • Organizer: International Conference on Machine Learning, Kyoto 2023
  • Int'l Joint Research
• [Presentation] μ+SR Knight Shift of the Hole-Doped Organic Metal kappa-(ET)4Hg2.78Cl8 (2023)
  • Author(s): D. P. Sari, Y. Cai, K. Kojima, I. Watanabe, H. Taniguchi, and Y. Ishii
  • Organizer: International Conference Hyperfine Interactions 2023, Nara, November 2023
  • Int'l Joint Research
• [Presentation] Superconductivity Nearby Quantum Spin Liquid States (2023)
  • Author(s): D. P. Sari, Y. Cai, U. Widyaiswari, A. E. Putri, E. Yamada, Y. Someya, A. Koda, Y. Ishii, F. L. Pratt, I. Watanabe, K. M. Kojima, and H. Taniguchi
  • Organizer: International Long-term Workshop of Quantum Information, Quantum Matter, Quantum Gravity, Workshop number YITP-T-23-01, Kyoto
  • Int'l Joint Research