Abstract
We report the temperature dependence of the transport critical current density for Ag-sheathed Ag-added (Ba, K)Fe2As2 superconducting wires fabricated by an ex situ powder-in-tube process. The microstructure of the core region of (Ba, K)Fe2As2 superconducting wires consists of the 122 phase, unreacted FeAs, and metastable phases. The transport critical current density, Jc, at 4.2 K is ∼1.0 × 104 A cm−2 (Ic = 60.7 A) in self-field and ∼1.1 × 103 A cm−2 (Ic = 6.6 A) in 10 T, while Jc at 20 K is ∼4.3 × 103 A cm−2 (Ic = 25.8 A) in self-field and ∼3.2 × 102 A cm−2 (Ic = 1.9 A) at 10 T. We discuss the temperature dependence of the critical current density. Compared to MgB2, Nb–Ti and Nb3Sn, we found that (Ba, K)Fe2As2 wires had much higher Ic retention in high magnetic fields up to 23 T.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
