Microscopic investigation of field-induced superconducting mechanism in itinerant ferromagnetic superconductors
| Project/Area Number |
26400375
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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 | Japan Atomic Energy Agency |
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Principal Investigator |
TOKUNAGA Yo 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門・先端基礎研究センター, 研究主幹 (00354902)
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| Co-Investigator(Kenkyū-buntansha) |
青木 大 東北大学, 金属材料研究所, 教授 (30359541)
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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 |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 強磁性超伝導 / 核磁気共鳴 / 量子臨界点 / 磁場誘起超伝導 / 三重臨界点 / 量子臨界現象 |
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| Outline of Final Research Achievements |
The re-entrant superconductivity (RSC), discovered in 2005, emerges near a field-induced quantum critical point (QCP) in a ferromagnetic (FM) superconductor URhGe. While the origin of this RSC is broadly thought to be associated with quantum critical fluctuations near the QCP, their exact nature had not been well identified. In this study, we conducted 59Co NMR study in a Co-doped single crystal of URhGe. The experiment revealed a divergence of electronic spin fluctuations in the vicinity of the QCP. Furthermore, the fluctuations observed are characteristic of a tricritical point. We have suggested these fluctuations as the pairing glue responsible for the RSC.
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Report
(4 results)
Research Products
(14 results)
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[Journal Article] Interplay between quantum fluctuations and reentrant superconductivity with a highly enhanced upper critical field in URhGe2016
Author(s)
Y. Tokunaga, D. Aoki, H. Mayaffre, S. Kramer, M. H. Julien, C. Berthier, M. Horvatic, H. Sakai, T. Hattori, S. Kambe, S. Araki
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Journal Title
Phys. Rev. B
Volume: 93
Issue: 20
Pages: 2011121-5
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Quantum tricritical uctuations driving mass enhancement and reentrant superconductivity in URhGe2016
Author(s)
Y. Tokunaga, D. Aoki, H. Mayaffre, S. Kramer, M.-H. Julien, C. Berthier, M. Horvatic, H. Sakai, S. Kambe, T. Hattori and S. Araki et al.,
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Journal Title
Journal of Physics: Conference Series
Volume: 683
Pages: 034706-034706
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] URhGe単結晶のNMRによる研究2017
Author(s)
徳永陽, 青木大, H. Mayaffre, S. Kraemer, M.-H.Julien, C. Berthier, M. Horvatic, 服部泰佑, 酒井宏典, 神戸振作, 荒木新吾
Organizer
日本物理学会第72回年次大会
Place of Presentation
大阪大学豊中キャンパス（大阪府豊中市）
Related Report
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[Presentation] URhGeのNMRによる研究2016
Author(s)
徳永陽, 青木大, H. Mayaffre, S. Kramer, M.-H. Julien, C. Berthier, M. Horvatic, 酒井宏典, 神戸振作, 服部泰佑, 荒木新吾
Organizer
日本物理学会 第71回年次大会
Place of Presentation
東北学院大学 (宮城県・ 仙台市)
Year and Date
2016-03-19
Related Report
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[Presentation] U(Rh1-xCox)GeのNMRによる研究 III2015
Author(s)
徳永陽, 青木大, H. Mayaffre, S. Kramer, M.-H. Julien, C. Berthier, M. Horvatic, 酒井宏典, 神戸振作, 服部泰佑, 荒木新吾
Organizer
日本物理学会 2015年 秋の分科会
Place of Presentation
関西大学 (大阪府・ 吹田市)
Year and Date
2015-09-16
Related Report
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