Multidirectionaly thermodynamic study on charge order and charge fluctuation on molecular dimer Mott insulators
| Project/Area Number |
16K05447
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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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| Research Field |
Condensed matter physics II
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2016-10-21 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 電荷秩序 / 分子性導体 / 強相関 / 熱容量測定 / 量子スピン液体 / 誘電測定 / スピン液体 / 強相関電子系 / 分子性固体 / 物性実験 |
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| Outline of Final Research Achievements |
We have performed heat capacity measurements and thermoelectric power measurements for two solid solution systems in order to clarify the charge order transition behavior and the excitation structure in molecular dimer Mott insulating system, which have phase boundary between quantum spin liquid phase and charge ordered phase. The both results of the heat capacity measurements and the thermoelectric power measurements indicate a higher order transition character in charge ordering of present systems. It is also suggested the non-magnetic transition and forming of charge ordering can be occurred independently. We found a new low-energy excitation structure distinguished from gap-less excitation in spin liquid state. A possibility of short range charge ordering was also suggested.
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| Academic Significance and Societal Importance of the Research Achievements |
分子ダイマー型Mott絶縁体系の電荷秩序転移が高次相転移的な性質を持ち、温度低下に従って徐々に電荷秩序が成長するという特徴は、本系においては短距離の電荷秩序形成が可能であることを示している。量子スピン液体領域の電荷秩序相境界近傍において、ギャップレス励起とは別種の低エネルギー励起を観測したこととを合わせて考察すると、量子スピン液体領域においても小規模の電荷秩序形成やその駆動力となる電荷揺らぎの影響が存在することを示唆している。この結果は、電荷揺らぎに焦点をあてることで量子スピン液体相の実現機構を解明できる可能性を示している。
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Report
(5 results)
Research Products
(23 results)
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[Journal Article] Unusual Magnetic State with Dual Magnetic Excitations in the Single Crystal of S = 1/2 Kagome Lattice Antiferromagnet CaCu3(OH)6Cl2・0.6H2O2017
Author(s)
H. Yoshida, N. Noguchi, Y. Matsushita, Y. Ishii, Y. Ihara, M. Oda, H. Okabe, S. Yamashita, Y. Nakazawa, A. Takata, T. Kida, Y. Narumi, and M. Hagiwara
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Journal Title
Journal of the Physical Society of Japan
Volume: 86
Issue: 3
Pages: 033704-033704
DOI
NAID
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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