Improvement of critical current properties of iron-based superconductors

2017 Fiscal Year Final Research Report

• 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
• 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

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.

Free Research Field

超伝導