Recent progress of round wires using iron-based superconductors is reviewed. Both transport and magnetic J c have been enhanced by several techniques such as purification of polycrystalline powders, high-pressure sintering (HIP), and control of drawing and sintering conditions. The present record of transport J c of round wires is realized when the wire with 122-type compounds is processed at 175 MPa with a value at 4.2 K under 100 kOe being 38 kA/cm2 using (Ba,K)Fe2As2. We also discuss HIP round wires of (Sr,K)Fe2As2 and recently fabricated CaKFe4As4. Details of the optimization of round wires to achieve large J c values are described.
|ジャーナル||Journal of Physics: Conference Series|
|出版ステータス||Published - 2019 10 15|
|イベント||31st International Symposium on Superconductivity, ISS 2018 - Tsukuba, Ibaraki, Japan|
継続期間: 2018 12 12 → 2018 12 14
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