Open AccessRecent Progress of Iron-Based Superconducting Round Wires
Author(s) -
Sunseng Pyon,
T. Tamegai,
Katsutoshi Takano,
Hideki Kajitani,
N. Koizumi,
Satoshi Awaji
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1293/1/012042
Subject(s) - sintering , superconductivity , crystallite , materials science , metallurgy , superconducting wire , composite material , condensed matter physics , physics
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/cm 2 using (Ba,K)Fe 2 As 2 . We also discuss HIP round wires of (Sr,K)Fe 2 As 2 and recently fabricated CaKFe 4 As 4 . Details of the optimization of round wires to achieve large J c values are described.