Improvement of critical current properties of iron-based superconductors

• Project/Area Number: 16K17510
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Ishida Shigeyuki 国立研究開発法人産業技術総合研究所, 電子光技術研究部門, 研究員 (90738064)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 臨界電流特性 / 鉄系超伝導体 / ドーピング依存性 / 磁束ピンニング / 面内異方性 / 超伝導線材 / 超伝導材料・素子

Outline of Final Research Achievements

In order to contribute to the development of superconductivity applications, we focused on the improvement of the critical current properties of iron-based superconductors, which are the new candidates for the high-field applications. In particular, we investigated the precise doping dependence of critical current density. We revealed that the critical current density is strongly enhanced at the underdoped region owing to an unusual vortex pinning mechanism arising from the mixing of superconducting and antiferromagnetic-orthorhombic phase. We also fabricated superconducting tapes using iron-based superconductors with different doping levels and obtained positive results toward the improvement of critical current properties.

Research Products

• [Int'l Joint Research] TU Wien(オーストリア)
• [Int'l Joint Research] TU Wien(オーストリア)
• [Journal Article] Direct observation of in-plane anisotropy of the superconducting critical current density in Ba(Fe1?xCox)2As2 crystals (2018)
  • Author(s): Hecher J.、Ishida S.、Song D.、Ogino H.、Iyo A.、Eisaki H.、Nakajima M.、Kagerbauer D.、Eisterer M.
  • Journal Title: Physical Review B Volume: 97 Issue: 1 Pages: 014511-014511
  • DOI: 10.1103/physrevb.97.014511
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals (2017)
  • Author(s): Shigeyuki Ishida, Dongjoon Song, Hiraku Ogino, Akira Iyo, Hiroshi Eisaki, Masamichi Nakajima, Jun-ichi Shimoyama, Michael Eisterer
  • Journal Title: PHYSICAL REVIEW B Volume: 95 Issue: 1 Pages: 014517-014517
  • DOI: 10.1103/physrevb.95.014517
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Fabrication of iron-based superconducting tapes using Ba1－xKxFe2As2 with x = 0.3 and 0.4 (2017)
  • Author(s): S. Ishida, H. Taira, A. Ishii, T. Asou, S. Itou, T. Nishio, Y. Tsuchiya, A. Iyo, H. Eisaki, K. Matsuzaki and Y. Yoshida
  • Journal Title: Superconductor Science and Technology Volume: 30 Issue: 5 Pages: 054001-054001
  • DOI: 10.1088/1361-6668/aa62d4
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 鉄系超伝導体Ba(Fe1-xCox)2As2およびBaFe2(As1-xPx)2単結晶の超伝導特性へのポストアニール効果 (2018)
  • Author(s): 石田茂之、宋東俊、荻野拓、伊豫彰、永崎洋、中島正道、下山淳一、D. Kagerbauer、M. Eisterer
  • Organizer: 第65回応用物理学会春季学術講演会
  • Invited
• [Presentation] Critical current properties of 122-type iron- based superconductors (2018)
  • Author(s): S. Ishida, D. Song, H. Ogino, A. Iyo, H. Eisaki, M. Nakajima, D. Kagerbauer, M. Eisterer
  • Organizer: Workshop on novel properties of complex oxides
  • Int'l Joint Research / Invited
• [Presentation] Effect of Post-annealing on Physical Properties of BaFe2As2-based Superconductors (2017)
  • Author(s): S. Ishida, D. Kagerbauer, D. Song, H. Ogino, M. Nakajima, M. Eisterer, H. Eisaki
  • Organizer: 30th International Symposium on Superconductivity (ISS2017)
  • Int'l Joint Research
• [Presentation] Effect of post annealing on physical properties of BaFe2As2-based superconductors (2017)
  • Author(s): S. Ishida, D. Kagerbauer, D. Song, H. Ogino, M. Nakajima, M. Eisterer, H. Eisaki
  • Organizer: European Conference on Applied Superconductivity (EUCAS 2017)
  • Int'l Joint Research
• [Presentation] 鉄系超伝導体Ba(Fe1-xCox)2As2単結晶の臨界電流特性へのポストアニール効果 (2017)
  • Author(s): 石田茂之、宋東俊、荻野拓、伊豫彰、永崎洋、中島正道、下山淳一、D. Kagerbauer、M. Eisterer
  • Organizer: 第78回応用物理学会秋季学術講演会
• [Presentation] Development of Fe-based superconducting wires and tapes at AIST (2016)
  • Author(s): S. Ishida, Y. Tsuchiya, A. Iyo, H. Eisaki, K. Matsuzaki, A. Nakano, Y. Yoshida, A. Ishii, T. Aso, S. Ito, T. Nishio, N. Shinohara, K. Tokiwa
  • Organizer: 1st Asian ICMC and CSSJ 50th Anniversary Conference
  • Place of Presentation: 金沢歌劇座
  • Year and Date: 2016-11-10
  • Int'l Joint Research / Invited
• [Presentation] BaFe2As2系超伝導体単結晶の臨界電流特性とピンニング機構のドーピング依存性 (2016)
  • Author(s): 石田茂之, 宋東俊, 伊豫彰, 永崎洋, 中島正道, 下山淳一, Michael Eisterer
  • Organizer: 日本物理学会
  • Place of Presentation: 金沢大学
  • Year and Date: 2016-09-13