2013 Fiscal Year Final Research Report
Renaissance of high-Tc superconductivity - Undoped cuprates are a Mott insulator?
| 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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| 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 |
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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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[Journal Article] Bulk superconductivity in undoped T'-La_<1.9>Y_<0.1>CuO_4 probed by muon spin rotation2014
Author(s)
K. M. Kojima, Y. Krockenberger, I. Yamauchi, M. Miyazaki, M. Hiraishi, A. Koda, R. Kadono, R. Kumai, H. Yamamoto, A. Ikeda, and M. Naito
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Journal Title
Physical Review
Volume: 89
Pages: Art.No.180508
DOI
Peer Reviewed
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[Presentation] T*型214銅酸化物薄膜の低エネルギーμSR測定2014
Author(s)
小嶋健児, 平石雅俊, 宮崎正範, 幸田章宏, 門野良典, Andreas Suter, Hubertus Luetkens, Yoshi Krockenberger, 山本秀樹, 池田愛, 内藤方夫
Organizer
日本物理学会第69回年次大会
Place of Presentation
東海大学
Year and Date
2014-03-27
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[Presentation] T' 型銅酸化物ノンドープ薄膜のバルク超伝導と表面磁性2013
Author(s)
小嶋健児, 門野良典, 平石雅俊, 宮崎正範, 幸田章宏, Andreas Suter, Hubertus Luetkens, Yoshiharu Krockenberger, 山本秀樹, 池田愛, 内藤方夫
Organizer
日本物理学会第68回年次大会
Place of Presentation
広島大学
Year and Date
2013-03-27
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[Presentation] T '型ノンドープ薄膜超伝導体の低エネルギーμ SR測定2011
Author(s)
小嶋健児, 平石雅俊, 宮崎正範, 幸田章宏, 門野良典, Andreas Suter , Hubertus Luetkens , Yoshi Krockenberger ,山本秀樹,池田愛,内藤方夫
Organizer
日本物理学会 2011年秋季大会
Place of Presentation
富山大学
Year and Date
2011-09-22
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