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

2023 年度 実施状況報告書

• 研究課題/領域番号: 21K13885
• 研究機関: 芝浦工業大学
• 研究代表者: Dita PuspitaSari 芝浦工業大学, 工学部, 助教 (00821919)
• 研究期間 (年度): 2021-04-01 – 2025-03-31
• キーワード: Non-Fermi liquid / Penetration depth / Knight shift / Cooper pair / Strange metal / Spin freezing / Quantum entanglement

研究実績の概要

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.

現在までの達成度 (区分)

2: おおむね順調に進展している

理由

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.

今後の研究の推進方策

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

研究成果

• [国際共同研究] ISIS Neutron and Muon Source(英国)
  • 国名: 英国
  • 外国機関名: ISIS Neutron and Muon Source
• [国際共同研究] TRIUMF(カナダ)
  • 国名: カナダ
  • 外国機関名: TRIUMF
• [雑誌論文] Pressure effect in the metallic state of λ-(BETS)2GaCl4 (2024)
  • 著者名/発表者名: Ueno Masaki、Tsutsumi Asako、Katsuoka Naoto、Sari Dita Puspita、Suzuki Takao、Ishii Yasuyuki
  • 雑誌名: Interactions 巻: 245 ページ: 71
  • DOI: 10.1007/s10751-024-01909-x
• [雑誌論文] 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)
  • 著者名/発表者名: Sari Dita Puspita、Widyaiswari Utami、Someya Yuta、Yamada Eiki、Taniguchi Hiromi、Watanabe Isao、Ishii Yasuyuki
  • 雑誌名: Solid State Phenomena 巻: 345 ページ: 47～52
  • DOI: 10.4028/p-1xerwq
• [学会発表] μSR Study of Hole-Doped Organic Metals: Superconductivity Nearby Quantum Spin Liquid States (2023)
  • 著者名/発表者名: 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
  • 学会等名: Universiti Sains Malaysia (USM-RIKEN) International Conference on Advanced Sciences, Penang 2024
  • 国際学会 / 招待講演
• [学会発表] Organic Superconductivity Nearby Quantum Criticality of a Magnetic Frustration (2023)
  • 著者名/発表者名: 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
  • 学会等名: The 1st Conference of Accelerator -Based Sciences and Technology CAST 2024, Jakarta 2024
  • 国際学会 / 招待講演
• [学会発表] Introduction to the Muon Technique and Science (2023)
  • 著者名/発表者名: D. P. Sari
  • 学会等名: ISIS Indonesia and Malaysia Webinar I Introduction to ISIS Neutron & Muon Source, ONLINE
  • 国際学会 / 招待講演
• [学会発表] μSR Study of Hole-Doped Organic Metals: Superconductivity Nearby Quantum Spin Liquid States (2023)
  • 著者名/発表者名: 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
  • 学会等名: International Conference on Machine Learning, Kyoto 2023
  • 国際学会
• [学会発表] μ+SR Knight Shift of the Hole-Doped Organic Metal kappa-(ET)4Hg2.78Cl8 (2023)
  • 著者名/発表者名: D. P. Sari, Y. Cai, K. Kojima, I. Watanabe, H. Taniguchi, and Y. Ishii
  • 学会等名: International Conference Hyperfine Interactions 2023, Nara, November 2023
  • 国際学会
• [学会発表] Superconductivity Nearby Quantum Spin Liquid States (2023)
  • 著者名/発表者名: 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
  • 学会等名: International Long-term Workshop of Quantum Information, Quantum Matter, Quantum Gravity, Workshop number YITP-T-23-01, Kyoto
  • 国際学会