| Project/Area Number |
23340098
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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 | Tokyo University of Agriculture and Technology |
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Principal Investigator |
NAITO Michio 東京農工大学, 工学(系)研究科(研究院), 教授 (40155643)
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| Co-Investigator(Kenkyū-buntansha) |
UEDA Shinya 東京農工大学, 大学院・工学研究院, 助教 (60442729)
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| Co-Investigator(Renkei-kenkyūsha) |
OYANAGI Hiroyuki 産業技術総合研究所, 光技術研究部門, 主幹研究員 (00344432)
YAMAMOTO Hideki 日本電信電話株式会社NTT物性科学基礎研究所, 機能物質科学研究部, 主幹研究員 (70393733)
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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 |
¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
Fiscal Year 2013: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2012: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2011: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
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| Keywords | 高温超伝導 / モット絶縁体 / MBE、エピタキシャル / 銅酸化物 / 母物質超伝導 / 母物質超伝導体 / 強相関電子系 / 超伝導材料・素子 |
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| Research Abstract |
It has been believed for a long time that high-Tc superconductivity in cuprates develops only upon doping holes or electrons in the parent antiferromagnetic Mott insulators. Recently, however, we discovered that T'-RE2CuO4 becomes superconducting without doping. The purpose of this research project is to establish superconductivity in the true "undoped" state of T'-RE2CuO4 and thereby to renovate the previous "doped Mott-insulator" scenario for high-Tc superconductivity. In the course of the research, we achieved, for the first time, superconductivity in bulk samples of undoped T'-La2-xSmxCuO4, which was synthesized via a molten alkaline hydroxide route. The bulk nature of superconductivity was also confirmed by low-energy muSR. Furthermore the systematic comparison of the Hall effect and upper critical fields between undoped T'-RE2CuO4 and electron-doped T'-(RE,Ce)2CuO4 revealed no discontinuity with doping, leading to the conclusion that both are in the same ground state.
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