| Project/Area Number |
23540382
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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 I
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
AGUI Akane 独立行政法人日本原子力研究開発機構, 原子力科学研究部門・量子ビーム応用研究センター, 研究主幹 (20360406)
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| Co-Investigator(Renkei-kenkyūsha) |
IKEDA Naoshi 岡山大学, 理学部, 教授 (00222894)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2013: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
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| Keywords | 光物性 / 非局所発光 / 光学過程 / モデル計算 / 軟エックス線発光 / 遷移金属酸化物 / マルチフェロイック / 放射光 / マルチフェロィック |
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| Research Abstract |
The crystal structure of LuFe2O4 has the alternate staking of triangular lattices of rare-earth elements, iron, and oxygen. The charge ordering of Fe2+ and Fe3+ ions in LuFe2O4 induces ferroelectricity below 330 K (Tco: charge order temperature). Above Tco, the three dimensional charge order changes into the two dimensional. In this study, the temperature dependence and polarization dependence of the X-ray emission spectra (XES) at Fe 2p-edge was investigated in order to study electric states in charge order state and charge disorder state. It was found that, in charge order state, Fe 2p edge -XES showed not only local optical process on each Fe2+ and Fe3+ site but also a non-local optical process between the Fe2+ and Fe3+ sites. It was found that the process was clear in plane direction. And more the non-local aspect was not clear in the charge disordered state.
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