| Project/Area Number |
24540359
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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 | 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(Renkei-kenkyūsha) |
MICHIMURA Shinji 埼玉大学, 科学分析支援センター, 助教 (40552310)
OHOYAMA Kenji 東北大学, 金属材料研究所, 准教授 (60241569)
NAKANISHI Yoshiki 岩手大学, 大学院工学研究科, 准教授 (70322964)
HIGEMOTO Wataru 独立行政法人日本原子力開発機構, 先端基礎研究センター, 研究主幹 (90291103)
KITO Hijiri 独立行政法人産業技術総合研究所, 電子光技術研究部門, 主任研究員 (30356886)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 強相関電子系 / 磁性 / フラストレーション / 低温物性 / 希土類金属間化合物 |
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| Outline of Final Research Achievements |
We found that the intermetallic compound Yb5Ge4 indicates the development of short-range correlations caused by magnetic frustration. Yb5Ge4 is the mother material of Yb4LiGe4, which is designed to reinforce the magnetic frustration effects performed by the Li-substitution. The diffraction anomalous fine structure method (DAFS), X-ray structural technique, reveals one of three crystallographic sites of Yb ions occupies the Yb3+ state and the other sites are in the Yb2+ state. The valence-ordered state already realizes at room temperatures, therefore, the low-dimensional magnetic network has been formed by Yb3+ ions. The anomalous behaviors in the temperature dependences of magnetization and specific heat of Yb5Ge4 are due to the development of short-range magnetic correlations, which arises from low-dimensionality effects of magnetic interactions.
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