Study of quantum spin liquid in two-dimensional triangular-lattice ytterbium compounds

• Project/Area Number: 18K03504
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Saitama University
• Principal Investigator: Kosaka Masashi 埼玉大学, 理工学研究科, 准教授 (20302507)
• Co-Investigator(Kenkyū-buntansha): 道村 真司 埼玉大学, 研究機構, 助教 (40552310)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 量子スピン液体 / フラストレーション / 希土類化合物 / 磁性 / 低温物性 / 低次元磁性 / 量子スピン系

Outline of Final Research Achievements

A quantum spin liquid state, which shows the strong correlation among the spins but does not order magnetically even at absolute zero temperature, is regarded as a new magnetic state. We synthesized the insulating compound KYbS2, where Yb3+ ions with the effective spin-1/2 form a two-dimensional triangular lattice. From our measurements in the low temperature region, we have demonstrated that KYbS2 is the spin liquid candidate. Furthermore, we also found that YbAgS2 shows the development of short-range magnetic correlations, which arises from one-dimensional chains of Yb3+ ions.

Academic Significance and Societal Importance of the Research Achievements

量子スピン液体状態に関する実験的なアプローチはこれまで主にd電子系の遷移金属化合物で行われてきた。本研究により、対象をf電子系の希土類化合物へ拡張する重要性を示すことができた。現在、f電子系化合物における2次元三角格子以外のフラストレート格子系への展開が進みつつある。量子スピン液体状態の特徴である強い量子揺らぎや量子もつれ、特異な励起状態は低消費電力の情報処理に活かせる可能性を持っており、現象に対する多くの知見を得ることは社会的な意義がある。

Research Products

• [Int'l Joint Research] ヴェストファーレン・ヴィルヘルム大学(ドイツ)
• [Int'l Joint Research] ヴェストファーレン・ヴィルヘルム大学(ドイツ)
• [Journal Article] Charge-Ordered State and Low-Dimensional Magnetic Fluctuations in Yb5Ge4 Single Crystal (2021)
  • Author(s): Michimura Shinji、Kosaka Masashi、Machida Ayumi、Numakura Ryosuke、Iizuka Ryosuke、Katano Susumu、Imai Yoshiki、Shirakawa Naoki、Yamasaki Yuichi、Nakao Hironori、Sato Hitoshi、Ueda Shigenori、Mimura Kojiro
  • Journal Title: Journal of the Physical Society of Japan Volume: 90 Issue: 4 Pages: 044703-044703
  • DOI: 10.7566/jpsj.90.044703
  • NAID: 40022539056
  • Peer Reviewed
• [Journal Article] Single-Crystal Growth and Physical Properties of EuZn2Ge2 (2020)
  • Author(s): Kosaka Masashi、Michimura Shinji、Hirabayashi Hikaru、Numakura Ryosuke、Iizuka Ryosuke、Kuwahara Keitaro、Uwatoko Yoshiya
  • Journal Title: Journal of the Physical Society of Japan Volume: 89 Issue: 5 Pages: 054704-054704
  • DOI: 10.7566/jpsj.89.054704
  • NAID: 210000158156
  • Peer Reviewed
• [Journal Article] Single Crystal Growth and Physical Properties of Ytterbium Sulfide KYbS2 with Triangular Lattice (2020)
  • Author(s): Iizuka Ryosuke、Michimura Shinji、Numakura Ryosuke、Uwatoko Yoshiya、Kosaka Masashi
  • Journal Title: JPS Conf. Proc. Volume: 30
  • DOI: 10.7566/jpscp.30.011097
  • Peer Reviewed / Open Access
• [Journal Article] Magnetic and Transport Properties of Rare Earth Zintl Compound Yb8Ge3Sb5 (2020)
  • Author(s): Kosaka Masashi、Kasuya Shunsuke、Michimura Shinji、Iizuka Ryosuke、Uwatoko Yoshiya
  • Journal Title: JPS Conf. Proc. Volume: 30
  • DOI: 10.7566/jpscp.30.011138
  • Peer Reviewed / Open Access
• [Journal Article] Magnetic hyperfine field splitting in the Zintl phase Eu2Mg4Si3 (2019)
  • Author(s): Block Theresa、Numakura Ryosuke、Kosaka Masashi、Michimura Shinji、Pottgen Rainer
  • Journal Title: Zeitschrift fur Naturforschung B Volume: 74 Issue: 5 Pages: 451-454
  • DOI: 10.1515/znb-2019-0055
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Magnetic properties of rare-earth sulfide YbAgS2 (2018)
  • Author(s): Iizuka Ryosuke、Numakura Ryosuke、Michimura Shinji、Katano Susumu、Kosaka Masashi
  • Journal Title: Physica B: Condensed Matter Volume: 536 Pages: 314-316
  • DOI: 10.1016/j.physb.2017.09.049
  • NAID: 130006709896
• [Journal Article] Single crystal growth and physical properties of the new ternary compound Eu2Mg4Si3 (2018)
  • Author(s): Numakura Ryosuke、Iizuka Ryosuke、Michimura Shinji、Katano Susumu、Kosaka Masashi
  • Journal Title: Physica B: Condensed Matter Volume: 536 Pages: 262-266
  • DOI: 10.1016/j.physb.2017.11.030
• [Journal Article] Influence of Pt substitution on magnetic properties of multipolar ordering compounds Ce(Pd,Pt)3S4 (2018)
  • Author(s): Shinji.Michimura, Ushio Nishikawa, Akihide Shimizu, Masashi Kosaka, Ryosuke Numakura, Ryosuke Iizuka, Susumu Katano
  • Journal Title: Physica B: Condensed Matter Volume: 536 Pages: 1-5
  • DOI: 10.1016/j.physb.2017.10.120
  • Peer Reviewed
• [Presentation] CeLiGe2の単結晶育成と物性 (2022)
  • Author(s): 久保田雅樹，大竹麻祐子，道村真司，小坂昌史
  • Organizer: 日本物理学会
• [Presentation] 混合原子価Euフッ化硫化物Eu3F4S2の単結晶育成と物性 (2022)
  • Author(s): 青木優樹，渡辺咲季，道村真司，小坂昌史
  • Organizer: 日本物理学会
• [Presentation] Cd-P混合フラックスを用いたRCd3P3 (R=La, Ce, Pr)の単結晶育成と物性 (2022)
  • Author(s): 庄司直輝，道村真司，小坂昌史
  • Organizer: 日本物理学会
• [Presentation] オリビン型一次元三角格子系Yb2ZnS4の物性測定及び単結晶構造解析 (2022)
  • Author(s): 藤田一希，道村真司，ユンハドン，小坂昌史
  • Organizer: 日本物理学会
• [Presentation] Erホウ化物ErNiB4の試料作成と物性 (2022)
  • Author(s): 松田遥香，道村真司，小坂昌史
  • Organizer: 日本物理学会
• [Presentation] 希土類絶縁体 YbTS2(T:Ag,Cu)の単結晶構造解析 (2021)
  • Author(s): 石﨑嵩人, 菅野友哉, 高野元輝, 星翔太, 荒瀬将太朗, 野田新太, 大曲雄大, 鬼丸孝博, 飯塚亮介, 道村真司, 小坂昌史, 佐賀山基, 大山研司
  • Organizer: 日本物理学会
• [Presentation] イッテルビウム絶縁体YbAgS2の低次元磁性 (2021)
  • Author(s): 飯塚亮介，道村真司，青木優樹，石﨑嵩人，山本隆文，大山研司，佐藤一彦，小林拓矢，谷口弘三，髭本亘，赤木暢，大久保晋，太田仁，小坂昌史
  • Organizer: 日本物理学会
• [Presentation] Ybジグザグ鎖をもつYbAgSe2の単結晶構造解析及び物性測定 (2021)
  • Author(s): 青木優樹，飯塚亮介，道村真司，小坂昌史
  • Organizer: 日本物理学会
• [Presentation] 希土類絶縁体YbTS2(T:Ag,Cu)の磁気秩序 (2020)
  • Author(s): 石﨑嵩人, 荒瀬将太朗, 野田新太, 山本隆文, 松川健, 大曲雄大, 鬼丸孝博, 飯塚亮介, 道村真司, 小坂昌史, 大山研司
  • Organizer: 日本物理学会
• [Presentation] Growth of Single Crystal and Physical Properties of Ytterbium Sulfide KYbS2 with Triangular Lattice (2019)
  • Author(s): R. Iizuka, R. Numakura, S. Michimura, Y. Uwatoko, and M. Kosaka
  • Organizer: International Conference on Strongly Correlated Electron Systems (SCES 2019)
  • Int'l Joint Research
• [Presentation] Magnetic and Transport Properties of Rare Earth Zintl Compound Yb8Ge3Sb5 (2019)
  • Author(s): M. Kosaka, S. Kasuya, S. Michimura, R. Iizuka, and Y. Uwatoko
  • Organizer: International Conference on Strongly Correlated Electron Systems (SCES 2019)
  • Int'l Joint Research
• [Presentation] Magnetic and Transport Properties of Ternary Pnictide Compound SmPtP (2019)
  • Author(s): S. Michimura, S. Sakai, K. Sekiya, R. Iizuka, R. Numakura, and M. Kosaka
  • Organizer: International Conference on Strongly Correlated Electron Systems (SCES 2019)
  • Int'l Joint Research
• [Presentation] 正方晶EuZn2Ge2の逐次相転移と磁気構造 (2019)
  • Author(s): 道村真司, 平林輝, 飯塚亮介, 酒井俊, 小坂昌史, 増田亮, 中尾裕則, 本元悟, 桑原慶太郎
  • Organizer: 日本物理学会
• [Presentation] 希土類硫化物GdAgS2の物性 (2019)
  • Author(s): 星野瑞希, 飯塚亮介, 道村真司, 小坂昌史
  • Organizer: 日本物理学会
• [Presentation] 二次元三角格子Yb硫化物YbAS2（A：アルカリ金属）の単結晶育成と物性 (2019)
  • Author(s): 飯塚亮介, 沼倉凌介, 道村真司, 小坂昌史
  • Organizer: 日本物理学会
• [Presentation] 希土類絶縁体YbAgS2の構造転移の研究 (2019)
  • Author(s): 山本隆文, 杉本和哉, 大山研司, 飯塚亮介, 道村真司, 小坂昌史, 松川健, 星川晃範, 石垣徹
  • Organizer: 日本物理学会
• [Presentation] ジントル化合物Yb8Ge3Sb5の単結晶育成と物性 (2019)
  • Author(s): 粕谷駿介, 沼倉凌介, 飯塚亮介, 道村真司, 小坂昌史
  • Organizer: 日本物理学会
• [Presentation] 希土類硫化物YbAgS2の低温下での粉末X線回折 (2018)
  • Author(s): 飯塚亮介, 沼倉凌介, 星野瑞希, 道村真司, 小坂昌史
  • Organizer: 日本物理学会
• [Presentation] 単結晶SmTP(T=Ni,Pt)の物性と結晶場の推定 (2018)
  • Author(s): 道村真司, 酒井俊, 飯塚亮介, 沼倉凌介, 小坂昌史
  • Organizer: 日本物理学会