| Project/Area Number |
26400370
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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 | Toho University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
桑原 英樹 上智大学, 理工学部, 教授 (90306986)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 強相関電子系 / マルチフェロイックス / ペロブスカイト型酸化物 / 強相関系 |
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| Outline of Final Research Achievements |
We have prepared EuTi1-xAlxO3 with 0 =< x =< 1, and investigated the magnetic properties in detail. As a result, the detailed magnetic phase diagram has been established. The ground state of the parent compound ETO is an antiferromagnetic (AFM) insulator. Substitution of Ti4+ with Al3+ oxidizes magnetic Eu2+ (J = 7/2) into non-magnetic Eu3+ (J = 0), and the ferromagnetic (FM) components are created. In x = 0.10, the ground state is an FM insulator, and the FM correlation is most enhanced around x = 0.25. The Eu2+/Eu3+ mixed valence probably plays a significant role in the FM behavior. In x >= 0.5, the FM transition temperature is decreasing toward zero with increasing x. This result implies that the FM quantum critical point exists in the heavily doped region.
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