| Project/Area Number |
25800206
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
YAMASE Hiroyuki 独立行政法人物質・材料研究機構, 超伝導物性ユニット, 主幹研究員 (10342867)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | 物性理論 / 強相関電子系 / 光物性 / ラマン散乱 / ネマチック / 自発的対称性の破れ / 銅酸化物超伝導 / 鉄系超伝導 / 銅酸化物超伝導体 / 鉄系超伝導体 |
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| Outline of Final Research Achievements |
An electronic nematic state breaks orientational symmetry of the system but retains the other symmetries. This instability is driven by spontaneous symmetry breaking, as in the case of superconductivity and magnetism. Hence it is fundamentally important in materials science to establish the existence of the electronic nematic state. Here, motivated by an insight that electronic nematic correlation functions can be measured directly by Raman scattering, we study nematic fluctuations associated with orbital and spin, which are vigorously discussed in iron-based superconductors. We establish a theory of Raman scattering by both fluctuations and also propose a new mechanism of high-temperature superconductivity due to orbital fluctuations.
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