Elucidating the peculiar properties of inversion-symmetry-broken surface superconductors with scanning tunneling microscopy
| Project/Area Number |
15H05453
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics I
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Hirahara Toru 東京工業大学, 理学院, 准教授 (30451818)
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| Research Collaborator |
TANAKA Tomoaki
YOSHINO Ryo
AKIYAMA Kenta
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥23,790,000 (Direct Cost: ¥18,300,000、Indirect Cost: ¥5,490,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2016: ¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
Fiscal Year 2015: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
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| Keywords | 超伝導 / 走査トンネル顕微鏡 / ラシュバ効果 / 物性実験 / 表面・界面 / 表面・界面物性 / 超薄膜 |
|---|
| Outline of Final Research Achievements |
We report the relationship between the surface superstructure of SrTiO3(001) (STO) substrate
and superconducting properties of single unit cell (1 UC) FeSe films using scanning tunneling
microscopy/spectroscopy (STM/STS). Under reflection high-energy-electron diffraction (RHEED) observation, we controlled the periodicity of the STO surface to 2×1 and √2×√2 by changing the annealing temperature and grew high-quality FeSe films. We found that the substrate periodicity can be imaged through the 1 UC FeSe from high-resolution STM observations and obtained clear evidence that the superconducting gap size depends on the surface periodicity (10-15 meV on 2×1 and 15-17.5 meV on √2×√2) for the first time. The results are discussed in terms of the surface termination of the STO substrate.
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Report
(4 results)
Research Products
(53 results)
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[Journal Article] Large-Gap Magnetic Topological Heterostructure Formed by Subsurface Incorporation of a Ferromagnetic Layer2017
Author(s)
T. Hirahara, S. V. Eremeev, T. Shirasawa, Y. Okuyama, T. Kubo, R. Nakanishi, R. Akiyama, A. Takayama, T. Hajiri, S. Ideta, M. Matsunami, K. Sumida, K. Miyamoto, Y. Takagi, K. Tanaka, T. Okuda, T. Yokoyama, S. Kimura, S. Hasegawa, E. V. Chulkov
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Journal Title
NANO Letters
Volume: 17
Issue: 6
Pages: 3493-3500
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Large-Gap Magnetic Topological Heterostructure Formed by Subsurface Incorporation of a Ferromagnetic Layer2018
Author(s)
T. Hirahara, S. V. Eremeev, T. Shirasawa, Y. Okuyama, T. Kubo, R. Nakanishi, R. Akiyama, A. Takayama, T. Hajiri, S. Ideta, M. Matsunami, K. Sumida, K. Miyamoto, Y. Takagi, K. Tanaka, T. Okuda, T. Yokoyama, S. Kimura, S. Hasegawa, and E. V. Chulkov
Organizer
BEC2018
Related Report
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[Presentation] Heterostructure of a topological insulator/magnetic insulator ultrathin film2017
Author(s)
Y. Okuyama, S. V. Eremeeev, R. Nakanishi, R. Akiyama, T. Shirasawa, Y. Sugiyama, K. Sumida, K. Miyamoto, T. Okuda, S. Ideta, K. Tanaka, E. V. Chulkov, S. Hasegawa, and T. Hirahara
Organizer
ISSS-8
Related Report
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[Presentation] トポロジカル絶縁体/磁性絶縁体超薄膜ヘテロ接合 I：結晶構造と電子状態2017
Author(s)
奥山裕磨, S. V. Eremeev, 白澤徹郎, 杉山裕弥, 角田一樹, 宮本幸治, 奥田太一, 出田真一郎, 田中清尚, E. V. Chulkov, 平原徹
Organizer
日本物理学会 第72回年次大会
Related Report
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[Presentation] Heterostructure of a topological insulator/magnetic insulator ultrathin film2017
Author(s)
Y. Okuyama, S. V. Eremeeev, R. Nakanishi, R. Akiyama, T. Shirasawa, Y. Sugiyama, K. Sumida, K. Miyamoto, T. Okuda, S. Ideta, K. Tanaka, E. V. Chulkov, S. Hasegawa, and T. Hirahara
Organizer
IOP Publishing Young Researchers' Meeting: Frontiers in Fundamental and Applied Physics
Related Report
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[Presentation] Surface and Bulk States of Ultrathin Bi films: Electronic Structure and Transport Properties2015
Author(s)
T. Hirahara, M. Aitani, T. Shirai, S. Ichinokura, M. Hanaduka, D. Y. Shin, T. Hajiri, M. Matsunami, K. Tanaka, S. Kimura, K. Kobayashi, and S. Hasegawa
Organizer
15th International Conference on the Formation of Semiconductor interfaces
Place of Presentation
International Conference Center Hiroshima
Year and Date
2015-11-15
Related Report
Int'l Joint Research
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