NMR studies of coexisting phase of antiferromagnetism and high-Tc superconductivity near Mott transition
| Project/Area Number |
26400356
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Osaka University |
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Principal Investigator |
Kitaoka Yoshio 大阪大学, 基礎工学研究科, 教授 (70110707)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 銅酸化物高温超伝導 / 高温超伝導発現機構 / NMR/NQR / 反強磁性と超伝導の共存 / 強相関電子系 / 多層系銅酸化物 |
|---|
| Outline of Final Research Achievements |
High-temperature superconductivity (HTSC) in copper oxides emerges on a layered CuO2 plane when an antiferromagnetic Mott insulator is doped with mobile hole carriers.
We presented our experimental findings such as the existence of the AFM metallic state in doped Mott insulators, the uniformly mixed phase of AFM and HTSC, and the emergence of d-wave SC with a maximum Tc just outside a critical carrier density, at which the AFM moment on a CuO2 plane disappears. These results can be accounted for by the Mott physics based on the t-J model. The superexchange interaction Jin among spins plays a vital role as a glue for Cooper pairs or mobile spin-singlet pairs, in contrast to the phonon-mediated attractive interaction among electrons established in the Bardeen-Cooper-Schrieffer (BCS) theory.
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Report
(4 results)
Research Products
(69 results)
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[Journal Article] Superconductivity and Antiferromagnetic Spin Fluctuations in LaFe(As1-xPx)(O1-yFy) probed by 31P-NMR2017
Author(s)
T. Shiota, H. Mukuda, M. Uekubo, F. Engetsu, M. Yashima, Y. Kitaoka, K. T. Lai, H. Usui, K. Kuroki, S. Miyasaka, and S. Tajima
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Journal Title
Journal of Physics: Conference Series
Volume: -
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Journal Article] Multiple Antiferromagnetic Spin Fluctuations and Novel Evolution of Tc in Iron-based superconductors LaFe(As1-xPx)(O1-yFy) revealed by 31P-NMR Studies2016
Author(s)
Takayoshi Shiota, Hidekazu Mukuda, Masahiro Uekubo, Fuko Engetsu, Mitsuharu Yashima, Yoshio Kitaoka, Kwing To Lai, Hidetomo Usui, Kazuhiko Kuroki, Shigeki Miyasaka, and Setsuko Tajima
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Journal Title
J. Phys. Soc. Jpn.
Volume: 85
Issue: 5
Pages: 053706-053706
DOI
NAID
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Presentation] 超高圧下硫化重水素における2D-NMR2016
Author(s)
阪野文秀, 椋田秀和, 八島光晴, 北岡良雄, 榮永茉利, 益田明宜, 清水克哉, M. I. Eremets, A. P. Drozdov
Organizer
日本物理学会 2016年 秋季大会
Place of Presentation
金沢大学（石川県・金沢市）
Year and Date
2016-09-15
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