“…The very first of this class of superconducting compound, LaFeAsO 1-x F x (1111), exhibits superconductivity at 26 K. However, over several years this class of compounds has expanded considerably to a variety of families, and superconducting critical temperature been raised to 58 K for the SmFeAsO 1−x F x [ 2 ]. The BaFe 2 As 2 /SrFe 2 As 2 (122) IBS family superconductors demonstrate critical temperatures (T c ) up to 37–38 K, high upper critical magnetic field H c2 more than 100 T, low anisotropy (γ = 1–2), and high J c (about 10 6 A/cm 2 ) [ 3 , 4 , 5 , 6 ], which make them appropriate candidates for practical use [ 7 , 8 ]. The 1111 IBS family is another possible candidate for industrial application.…”