Superconducting properties of FeSe wires and tapes prepared by gas   diffusion technique
  Superconducting FeSe in the form of wires and tapes were successfully fabricated using a novel gas diffusion procedure. Structural analysis by mean of x-ray diffraction shows that themain phase of tetragonal PbO-type FeSe was obtained by this synthesis method. The zero resistivity transition temperature of the FeSe was confirmed to be 9.3 K. The critical current density as high as 137 A/cm^2 (4 K, self field) has been observed. The results suggest that the diffusion procedure is promising in preparing high-quality FeSe wires and tapes. 
Zhaoshun Gao, Yanpeng Qi, Lei Wang, Dongliang Wang, Xianping Zhang,   Chao Yao, Yanwei Ma
cond-mat.supr-con