2021 Fiscal Year Final Research Report
Anomalous physical properties according to freedom of multipole for filled skutterudite compounds
Project/Area Number |
19K03735
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
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Research Institution | Muroran Institute of Technology |
Principal Investigator |
SEKINE Chihiro 室蘭工業大学, 大学院工学研究科, 教授 (60261385)
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Co-Investigator(Kenkyū-buntansha) |
椎名 亮輔 琉球大学, 理学部, 教授 (30326011)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 多極子 / 充填スクッテルダイト / 金属ー絶縁体転移 |
Outline of Final Research Achievements |
We attempted to synthesize filled skutterudite compounds such as Sm(Ru1-xRhx)4P12 (compounds in which Ru sites of SmRu4P12 are substituted by a small amount of Rh) and DyRu4P12 using a high-pressure synthesis method by a multi-anvil press. We have succeeded in synthesizing high-quality samples. The basic physical properties of the obtained samples were measured, and the magnetic field-temperature phase diagrams of these samples could be obtained. It was found that the metal-non-metal transition of SmRu4P12 is very sensitive to Rh substitution, and that the transition disappears with a small amount of Rh substitution, especially the transition to phase II is greatly suppressed. In addition, the magnetic field dependence of the magnetic transition of DyRu4P12 suggested that multipole degrees of freedom may be involved.
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Free Research Field |
固体物理学
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Academic Significance and Societal Importance of the Research Achievements |
多極子は固体中の電子における電荷・磁荷分布の異方性を特徴づける量であり、いわゆる「隠れた秩序(Hidden Order)」の解明において重要な鍵であると考えられているが、高次の多極子は直接観測の手段が限られ、実験的に捉えにくく、これまでに、多くの実験的・理論的研究が行われ、その描像は明らかにされつつあるが、完全な理解には至っていない。充填スクッテルダイト化合物は、多極子研究において最も重要な物質群の一つである。本研究により得られた成果は、多極子自由度が関与する異常物性の発現機構の解明に寄与でき、強相関電子系の多様な秩序状態に新しい知見を与え、固体物理学(相転移物理)の発展に貢献できる。
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