Development of Iron-based superconducting materials towards high field applications

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H05519
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Electronic materials/Electric materials
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: Yamamoto Akiyasu 東京農工大学, 工学(系)研究科(研究院), 特任准教授 (20581995)
• Research Collaborator: TOKUTA Shinnosuke 東京農工大学, 大学院工学府, 大学院生 ; SANOGAWA Yu 東京農工大学, 大学院工学府, 大学院生 ; WEISS Jeremy コロラド大学, ボルダー校・物理学科, 助教 ; AINSLIE Mark ケンブリッジ大学, 工学部, EPSRC Early Career Fellow ; POLYANSKII Anatolii 米国立強磁場研究所, 超伝導応用研究センター, 研究員 ; LARBALESTIER David 米国立強磁場研究所, 超伝導応用研究センター, 所長 ; HELLSTROM Eric フロリダ州立大学, 機械工学科, 教授
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 超伝導 / 鉄系高温超伝導体 / 高磁場応用

Outline of Final Research Achievements

A trapped field of over 1 T at 5 K and 0.5 T at 20 K has been measured between a stack of magnetized cylinders of bulk polycrystalline Ba0.6K0.4Fe2As2 superconductors 10 mm in diameter. Magneto-optical imaging revealed a trapped field distribution corresponding to uniform macroscopic current loops circulating through the sample. A standard numerical modelling technique using the measured Jc(B, T) characteristics of a small specimen reproduced the experimentally measured trapped fields well, again indicating the homogeneous current loops in the polycrystalline bulk. Given the untextured polycrystalline nature of the cylinders and their large irreversibility field (> 90 T), it is expected that larger IBSC bulks could trap fields in excess of 10 T.

Free Research Field

超伝導材料