Iron-chalcogenide FeSe$_{0.5}$Te$_{0.5}$ coated superconducting tapes   for high field applications
  The high upper critical field characteristic of the recently discovered iron-based superconducting chalcogenides opens the possibility of developing a new type of non-oxide high-field superconducting wires. In this work, we utilize a buffered metal template on which we grow a textured FeSe$_{0.5}$Te$_{0.5}$ layer, an approach developed originally for high temperature superconducting coated conductors. These tapes carry high critical current densities (>1$\times10^{4}$A/cm$^{2}$) at about 4.2K under magnetic field as high as 25 T, which are nearly isotropic to the field direction. This demonstrates a very promising future for iron chalcogenides for high field applications at liquid helium temperatures. Flux pinning force analysis indicates a point defect pinning mechanism, creating prospects for a straightforward approach to conductor optimization. 
Weidong Si, Juan Zhou, Qing Jie, Ivo Dimitrov, V. Solovyov, P. D.   Johnson, J.Jaroszynski, V. Matias, C. Sheehan, and Qiang Li
cond-mat.supr-con