2013 Fiscal Year Final Research Report
Variation of the superconducting order parameters in quasi-one-dimensional superconductors revealed by field-angle-resolved calorimetory under pressure
| Project/Area Number |
23540407
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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 | Kyoto University |
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Principal Investigator |
YONEZAWA Shingo 京都大学, 理学(系)研究科(研究院), 助教 (30523584)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 非従来型超伝導 / スピン三重項超伝導 / 磁気熱量効果 / 比熱 / 一軸性歪み / 一次相転移 / 超伝導ギャップ構造 |
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| Research Abstract |
The purpose of this research project is to extract interesting properties of superconductors from thermodynamic measurements and from pressure experiments. In particular, by using sensitive calorimeters that we ourselves developed, we tried to discover phenomena that could not be resolved in previous studies.
The most important achievement of this project is the result of the magnetocaloric effect measurements of the spin-triplet superconductor Sr2RuO4. We found that at low temperatures the superconducting-normal state transition is of first order when the magnetic field is exactly parallel to the crystalline ab plane. This fact indicates that the superconductivity in this material is destroyed by unknown mechanism. In addition, we revealed the superconducting gap structure of the organic superconductor (TMTSF)2ClO4 from specific heat measurements. We furthermore investigated uniaxial strain effects on ruthenium oxides.
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Research Products
(27 results)
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[Journal Article] Strong Increase of Tc of Sr2RuO4 Under Both Tensile and Compressive Strain2014
Author(s)
C. W. Hicks, D. O. Brodsky, E. A. Yelland, A. S. Gibbs, J. A. N. Bruin, M. E. Barber, S. D. Edkins, K. Nishimura, S. Yonezawa, Y. Maeno, A. P. Mackenzie
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Journal Title
Science
Volume: 344
Pages: 283
DOI
Peer Reviewed
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[Remarks] アウトリーチ活動
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[Remarks] 2011-2013年度京都府立嵯峨野高等学校学校評議員
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[Remarks] 2011-2013年度京都物理コンテスト運営委員
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[Remarks] 2011-2013年度京都大学オープンキャンパス に参加
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[Remarks] 2012年度「最先端科学の体験型学習講座」Experienced-based Learning Course for Advanced Science(ELCAS)担当
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[Remarks] 報道関連
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[Remarks] プレスリリース「ルテニウム酸化物における超伝導の一次相転移の発見-超伝導と磁場の未知の相互作用メカニズムの存在を示唆-」(京都大学ホームページ, 2013年2月15日)
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[Remarks] 新聞報道「京大, ルテニウム酸化物の超電導で「一次相転移」を確認」(日刊工業新聞, 2013年2月20日朝刊25面)
