Elucidation of the electronic state and the mechanism of the undoped superconductivity in the genuine T'-type cuprates
Project/Area Number |
17H02915
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Condensed matter physics II
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Research Institution | Tohoku University |
Principal Investigator |
KOIKE Yoji 東北大学, 工学研究科, 名誉教授 (70134038)
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Project Period (FY) |
2017-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2019: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2017: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
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Keywords | 高温超伝導 / 銅酸化物 / ノンドープ超伝導 / ノントープ超伝導 |
Outline of Final Research Achievements |
We have succeeded in synthesizing electron-doped and hole-doped polycystalline samples of T'-La1.8Eu0.2CuO4-yFy and T'-La1.8-xEu0.2SrxCuO4. The carrier-doping dependence of Tc has been clarified. From NMR and muon spin relaxation measurements, it has been concluded that the superconductivity has d-wave symmetry due to the spin fluctuations. The origin of superconducting carriers may be due to the collapse of the so-called charge-transfer gap, but this has not yet been settled. Moreover, various measurements have been carried out for single crystals of electron-doped T'-Pr1.3-xLa0.7CexCuO4. It has been found that antiferromagnetic fluctuations are large in these crystals and it has also been concluded that the superconductivity has d-wave symmetry due to the spin fluctuations.
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Academic Significance and Societal Importance of the Research Achievements |
キャリアドーピングなしでも超伝導になる真性T’構造銅酸化物の真の物性相図を完成させた本研究は、「銅酸化物における高温超伝導はモット絶縁体へのキャリアドーピングによって発現する」という常識を打ち破り、超伝導機構の多様性を示したことは非常に大きな意義がある。 真性T’構造銅酸化物は、銅の周りの酸素が4配位であるという特徴を有しており、他の4配位銅酸化物の研究への波及効果が期待できる。
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Report
(4 results)
Research Products
(58 results)
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[Journal Article] Pressure tuning of structure, superconductivity, and novel magnetic order in the Ce-underdoped electron-doped cuprate T’-Pr1.3-xLa0.7CexCuO4 (x = 0.1)2017
Author(s)
Z. Guguchia, T. Adachi, Z. Shermadini, T. Ohgi, J. Chang, E. S. Bozin, F. von Rohr, A. M. dos Santos, J. J. Molaison, R. Boehler, Y. Koike, A. R. Wieteska, B. A. Frandsen, E. Morenzoni, A. Amato, S. J. L. Billinge, Y. J. Uemura and R. Khasanov
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Journal Title
Physical Review B
Volume: 96
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Undoped high-Tc superconductivity in T'-La1.8Eu0.2CuO4+δ revealed by 63,65Cu and 139La NMR: Bulk superconductivity and antiferromagnetic fluctuations2017
Author(s)
H. Fukazawa, S. Ishiyama, M. Goto, S. Kanamaru, K. Ohashi, T. Kawamata, T. Adachi, M. Hirata, T. Sasaki, Y. Koike and Y. Kohori
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Journal Title
Physica C
Volume: 541
Pages: 30-35
DOI
Related Report
Peer Reviewed
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[Presentation] Suppression of Antiferromagnetic Spin Fluctuations by Electron Doping in T’-Pr1.3-xLa0.7CexCuO4 Probed by NMR2019
Author(s)
H. Fukazawa, YS. Lee, S. Kanamaru, M. Goto, Y. Kohori, A. Takahashi, T. Kawamata, K. Kawabata, K. Tajima, T. Adachi, Y. Koike
Organizer
東北大学金属材料研究所ワークショップ "Reseach Frontier of Advanced Spectroscopies for Correlated Electron Systems"
Related Report
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[Presentation] Pseudogap behavior in T’-Pr1.3-xLa0.7CexCuO4 (x = 0.10) probed by NMR2019
Author(s)
YS. Lee, S. Kanamaru, M. Goto, H. Fukazawa, Y. Kohori, A. Takahashi, T. Kawamata, K. Kawabata, K. Tajima, T. Adachi, Y. Koike
Organizer
Ito International Research Center Conference, The University of Tokyo & ISSP International Workshop "Spectroscopies in Novel Superconductors" (SNS2019)
Related Report
Int'l Joint Research
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[Presentation] 電子ドープ型高温超伝導体T’-Pr1.3-xLa0.7CexCuO4+δの63,65Cu,139La-NMRII2019
Author(s)
Yongsun Lee, 渡井将希, 金丸周平, 後藤雅人, 深澤英人, 小堀洋, 高橋晶, 川股隆行, 川端公貴, 田島一輝, 足立匡, 小池洋二
Organizer
日本物理学会2019年秋季大会
Related Report
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[Presentation] X線吸収微細構造解析によるLa1.8Eu0.2CuO4の電子状態に対するアニール効果の研究2019
Author(s)
浅野駿, 石井賢司, 松村大樹, 辻卓也, 伊奈稔哲, 齋藤真, 春原稔樹, 川股隆行, 小池洋二, 工藤康太, 藤田全基
Organizer
日本物理学会2019年秋季大会
Related Report
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[Presentation] 63,65CuNMR studies of superconducting T'-La1.8Eu0.2CuO4+δ with Nd2CuO4 structure2018
Author(s)
Y. Kohori, H. Fukazawa, S. Ishiyama, M. Goto, S. Kanamaru, K. Ohashi, T. Kawamata, T. Adachi, M. Hirata, Y. Koike
Organizer
12th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors
Related Report
Int'l Joint Research
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[Presentation] Reduction and Electron-Doping Effects on the Cu-Spin Correlation in Electron-Doped HIgh-Tc Cuprates Pr2-x-yLayCexCuO4+δ2018
Author(s)
T. Adachi, T. Sumura, M. A. Baqiya, T. Ishimoto, H. Kuwahara, K. Kurashima, I. Watanabe, A. Koda, M. Miyazaki, R. Kadono, Y. Koike
Organizer
12th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors
Related Report
Int'l Joint Research
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[Presentation] Extended superconduting dome of Pr1.3-xLa0.7CexCuO4 after protect annealing2018
Author(s)
C. Lin, M. Horio, K. Koshiishi, S. Nakata, K. Hagiwara, K. Ono, K. Horiba, H. Kumigashira, S. Ideta, K. Tanaka, T. Ohgi, T. Kawamata, H. Sato, Y. Koike, T. Adachi, A. Fujimori
Organizer
日本物理学会第73回年次大会
Related Report
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[Presentation] Over-reduction effects on the Cu-spin correlation in the electron-doped T'-cuprate Pr1.3-xLa0.7CexCuO4+δ (x = 0.10)2017
Author(s)
T. Sumura, T. Ishimoto, H. Kuwahara, K. Kurashima, Y. Koike, I. Watanabe, M. Miyazaki, A. Koda, R. Kadono, T. Adachi
Organizer
The 14th International conference on Muon Spin Rotation, Relaxation and Resonance
Related Report
Int'l Joint Research
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[Presentation] Cu-spin correlation and novel electronic state in the electron-doped high-Tc cuprates2017
Author(s)
T. Adachi, T. Sumura, M. A. Baqiya, A. Takahashi, T. Konno, T. Ohgi, K. Kurashima, T. Kawamata, T. Ishimoto, H. Kuwahara, I. Watanabe, A. Koda, M. Miyazaki, R. Kadono, S. Awaji, Y. Koike
Organizer
28th International Conference on Low temperature Physics
Related Report
Int'l Joint Research
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[Presentation] Cu-spin Correlation and Novel Electronic State in the Electron-Doped High-Tc T'-Superconductors2017
Author(s)
T. Adachi, T. Sumura, M. A. Baqiya, A. Takahashi, T. Konno, T. Ohgi, K. Kurashima, T. Kawamata, T. Ishimoto, H. Kuwahara, I. Watanabe, A. Koda, M. Miyazaki, R. Kadono, S. Awaji, Y. Koike
Organizer
International Conference "Electron Correlation in Superconductors and Nanostructures"
Related Report
Int'l Joint Research / Invited
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[Presentation] Undoped superconductivity and Novel Electronic State in the High-Tc T'-Cuprates2017
Author(s)
T. Adachi, T. Sumura, M. A. Baqiya, A. Takahashi, T. Konno, T. Ohgi, K. Ohashi, K. Kurashima, T. Kawamata, T. Ishimoto, H. Kuwahara, I. Watanabe, A. Koda, M. Miyazaki, R. Kadono, S. Awaji, Y. Koike
Organizer
European Material Research Society (E-MRS) Fall Meeting 2017
Related Report
Int'l Joint Research / Invited
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