| Project/Area Number |
23340093
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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 |
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Principal Investigator |
FUJITA Masaki 東北大学, 金属材料研究所, 教授 (20303894)
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| Co-Investigator(Kenkyū-buntansha) |
YAMASE Hiroyuki 国立研究開発法人物質・材料研究機構, 環境・エネルギー材料部門 超伝導物性ユニット, 主任研究員 (10342867)
MORI Michiyasu 国立研究開発法人日本原子力研究開発機構, 先端基礎研究センター, 副主任研究員 (30396519)
ADACHI Tadashi 上智大学, 理工学部, 准教授 (40333843)
ISHII Kenji 国立研究開発法人日本原子力研究開発機構, 量子ビーム応用研究部門 構造物性研究ユニット, 研究副主任 (40343933)
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| Project Period (FY) |
2011-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥19,630,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥4,530,000)
Fiscal Year 2014: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2013: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2012: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2011: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
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| Keywords | 高温超伝導 / 中性子散乱 / 結晶作成 / 放射光X線散乱 / 単結晶作成 / 量子ビーム / 単結晶育成 |
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| Outline of Final Research Achievements |
This research aims to clarify an existence of complex excitation composed of spin, charge and phonon degrees of freedom in high-Tc cuprate superconductor, with utilizing quantum beams such as neutron, synchrotron X-ray and muon. The hierarchical spin excitation attributed to the localized and itinerant nature of electron was found in the hole-doped system. Furthermore, we clarified an enhancement of spin-phonon coupling by the hole-doping. On the other hand, in the electron-doped system, the evidence of spin-charge coupling was seen in the high-energy excitation. The most important result of this research is that we clarified an existence of electron-hole asymmetry in the spin and charge correlations in cuprate superconductors. The coupling among spin change and phonon is also different in the hole and electron doped systems.
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