Phase structures of superconducting gaps in iron-based superconductors
Project/Area Number |
24340089
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Partial Multi-year Fund |
Section | 一般 |
Research Field |
Condensed matter physics II
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Research Institution | The Institute of Physical and Chemical Research |
Principal Investigator |
HANAGURI Tetsuo 独立行政法人理化学研究所, 創発物性科学研究センター, チームリーダー (40251326)
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Co-Investigator(Renkei-kenkyūsha) |
NIITAKA Seiji 独立行政法人理化学研究所, 無機電子複雑系研究チーム, 基幹研究所研究員 (60392057)
KITAGAWA Kentaro 東京大学, 物性研究所, 特任研究員 (90567661)
SASAGAWA Takao 東京工業大学, 応用セラミックス研究所, 准教授 (30332597)
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Research Collaborator |
KIM KeeHoon
WATASHIGE Tatsuya
KASAHARA Shigeru
SHIBAUCHI Takasada
MATSUDA Yuji
WOFT Thomas
MEINGAST Christoph
V. LÖHNEYSEN Hilbert
|
Project Period (FY) |
2012-04-01 – 2015-03-31
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Project Status |
Completed (Fiscal Year 2014)
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Budget Amount *help |
¥20,020,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥4,620,000)
Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2013: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2012: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
|
Keywords | 鉄系超伝導体 / 走査型トンネル顕微鏡 / 超伝導ギャップ / 準粒子干渉効果 / BCS-BECクロスオーバー / STM / 双晶 / STM/STS / 軌道秩序 |
Outline of Final Research Achievements |
We have used spectroscopic imaging scanning tunneling microscopy to investigate the superconducting gaps and the electronic states of the iron-based superconductors LiFeAs and FeSe. We found that some defects in LiFeAs generate in-gap bound state. We also examined the effects of twin boundaries on the superconducting gap of FeSe and found that the twin boundary induces a novel superconducting state that breaks the time-reversal symmetry. The band dispersions of FeSe were determined by the quasi-particle interference effect. The estimated Fermi energy is smaller than 10 meV, being of the same order as the superconducting gap. This means that FeSe is in the BCS-BEC crossover regime. The observed quasi-particle interference patterns possess strong in-plane anisotropy which may reflect the orbital ordering in this material.
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Report
(4 results)
Research Products
(21 results)
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[Journal Article] Field-Induced Superconducting Phase of FeSe in the BCS-BEC Crossover2014
Author(s)
S. Kasahara, T. Watashige, T. Hanaguri, Y. Kohsaka, T. Yamashita, Y. Shimoyama, Y. Mizukami, R. Endo, H. Ikeda, K. Aoyama, T. Terashima, S. Uji, T. Wolf, H. v. Loehneysen, T. Shibauchi, Y. Matsuda
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Journal Title
Proceedings of the National Academy of Sciences of the United States of America
Volume: 111
Issue: 46
Pages: 16309-16313
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Superconductivity in an electron band just above the Fermi level: possible route to BCS-BEC superconductivity2014
Author(s)
K. Okazaki, Y. Ito, Y. Ota, Y. Kotani, T. Shimojima,T. Kiss, S. Watanabe, C.-T. Chen, S. Niitaka, T. Hanaguri, H. Takagi, A. Chainani,S. Shin
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Journal Title
Scientific Reports.
Volume: 4
Issue: 1
Pages: 4109-4109
DOI
Related Report
Peer Reviewed
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[Presentation] FeSeの超伝導ギャップのFriedel振動2015
Author(s)
花栗哲郎, 綿重達哉, 幸坂祐生, 岩谷克也, 町田理, 笠原成, 小林遼, 芝内孝禎, 松田祐司, A. Bohmer, T. Wolf, C. Meingast, H. v. Lohneysen
Organizer
日本物理学会第70回年次大会
Place of Presentation
早稲田大学
Year and Date
2015-03-21 – 2015-03-24
Related Report
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[Presentation] Friedel oscillations of the superconducting gap in FeSe2015
Author(s)
T. Hanaguri, T. Watashige, Y. Kohsaka, K. Iwaya, T. Machida, T. Shibauchi, R. Kobayashi, S. Kasahara, Y. Matsuda, A. Bohmer, T. Wolf, C. Meingast and H. v. Lohneysen
Organizer
American Physical Society March Meeting
Place of Presentation
San Antonio, USA
Year and Date
2015-03-01 – 2015-03-06
Related Report
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[Presentation] Superconducting gap and quasi-particle interference in FeSe2014
Author(s)
T. Hanaguri, T. Watashige, Y. Kohsaka, K. Iwaya, Y. Fu, S. Kasahara, D. Watanabe, Y. Mizukami, T.Mikami, Y. Kawamoto, S. Kurata, T. Shibauchi, Y. Matsuda, A. Bohmer, T. Wolf, P. Adelmann, C. Meingast and H. v. Lohneysen
Organizer
27th International Symposium on Superconductivity
Place of Presentation
船堀
Year and Date
2014-11-25 – 2014-11-27
Related Report
Invited
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[Presentation] Electronic states of FeSe studied by STM/STS2014
Author(s)
T. Hanaguri, T. Watashige, Y. Kohsaka, K. Iwaya, T. Machida, S. Kasahara, D. Watanabe, Y. Mizukami, T. Mikami, Y. Kawamoto, S. Kurata, T. Shibauchi, Y. Matsuda, A. Bohmer, T. Wolf, P. Adelmann, C. Meingast and H. v. Lohneysen
Organizer
Research Frontier of Transition-metal Compounds Opened by Advanced Spectroscopies
Place of Presentation
東北大学
Year and Date
2014-09-30 – 2014-10-02
Related Report
Invited
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[Presentation] Spectroscopic-imaging scanning tunneling microscopyon FeSe single crystals2014
Author(s)
T. Hanaguri, T. Watashige, Y. Kohsaka, K. Iwaya, Y. Fu, S. Kasahara, D. Watanabe, Y. Mizukami, T. Mikami, Y. Kawamoto, S. Kurata, T. Shibauchi, Y. Matsuda, A. Bohmer, T. Wolf, P. Adelmann, C. Meingast and H. v. Lohneysen
Organizer
The Beijing International Workshop (II) on Iron-Based Superconductors
Place of Presentation
北京, 中国
Year and Date
2014-08-04 – 2014-08-08
Related Report
Invited
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[Presentation] Superconducting Gap and Quasi-Particle Interference in FeSe2014
Author(s)
T. Hanaguri, T. Watashige, Y. Kohsaka, K. Iwaya, Y. Fu, S. Kasahara, D. Watanabe, Y. Mizukami, T. Mikami, Y. Kawamoto, S. Kurata, T. Shibauchi, Y. Matsuda, A. Bohmer, T. Wolf, P. Adelmann, C. Meingast and H. v. Lohneysen
Organizer
The 4th International Conference of Superconductivity and Magnetism
Place of Presentation
Antalya, Turkey
Year and Date
2014-04-27 – 2014-05-02
Related Report
Invited
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