| Project/Area Number |
18K03504
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | Saitama University |
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Principal Investigator |
Kosaka Masashi 埼玉大学, 理工学研究科, 准教授 (20302507)
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| Co-Investigator(Kenkyū-buntansha) |
道村 真司 埼玉大学, 研究機構, 助教 (40552310)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥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)
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| 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 |
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| 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.
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| 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。
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