Optimization of a Non-arsenic Iron-based Superconductor for Wire   Fabrication
  We report on the optimization of synthesis of iron-selenide (non-arsenic) superconducting powders that are based on '122' composition, with optimal Tc = 38 K and Jc = 10^5 A/cm2 (4 K). We also report on the wire proof-of concept for these materials, by producing ~ 40 ft of wire that produce Ic. The 122 selenides are more difficult to synthesize and have more complex crystal structures compared to '11' selenides (FeSe and FeSe1-xTex), but they do offer higher Tc and might provoke a natural extension for 11 work. 
Jonathan E. Mitchell, Daniel A. Hillesheim, Craig A. Bridges, M.Parans   Paranthaman, Kris Gofryk, Mike Rindfleisch, Mike To...
cond-mat.supr-con cond-mat.mtrl-sci