| Project/Area Number |
23340097
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tohoku University (2012-2013)
The University of Tokyo (2011) |
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Principal Investigator |
SATO Taku J 東北大学, 多元物質科学研究所, 教授 (70354214)
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| Co-Investigator(Kenkyū-buntansha) |
NAMBU Yusuke 東北大学, 多元物質科学研究所, 助教 (60579803)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2012: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2011: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
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| Keywords | 中性子散乱 / 鉄系超伝導 / X線回折 / 局所構造 / スピン揺らぎ / 軌道揺らぎ / 磁気構造解析 / 散漫散乱 / PDF解析 / 磁気相図 / 磁性 / 超伝導 / 非弾性散乱 / 磁気散乱 / 鉄系超伝導体 / 中性子磁気散乱 / 軌道秩序 / 磁気秩序 / 磁気揺動 |
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| Research Abstract |
Superconductivity in the Fe-based compounds, first reported by Japanese researchers in 2008, have attracted tremendous interests of researchers because of its very high transition temperature up to 56K. Since there exists antiferromagnetically ordered phase adjacent to the superconducting phase, it was argued in the beginning that the superconductivity is due to the spin fluctuations. On the other hand, it was also suggested from the multi-band character of the Fe 3d electrons that orbital degree of freedom may also play an essential role. In this work, we have tried to clarify the role of the orbital degree of freedom in the Fe-based superconductors. We showed that the anisotropic spin correlation observed in the paramagnetic phase can be explained by the random phase approximation, whereas, slight structural distortion was observed by X-ray and neutron diffraction in the paramagnetic phase, which may be related to the orbital degree of freedom. We also worked on the 123 systems.
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