Enhancement of the upper critical field in codoped iron-arsenic high-temperature superconductors
Abstract
We present the first study of codoped iron-arsenide superconductors of the 122 family (Sr/Ba)(1-x)KxFe(2-y)CoyAs2 with the purpose to increase the upper critical field Hc2 compared to single doped (Sr/Ba)Fe2As2 materials. Hc2 was investigated by measuring the magnetoresistance in high pulsed magnetic fields up to 64 T. We find, that Hc2 extrapolated to T = 0 is indeed enhanced significantly to ~ 90 T for polycrystalline samples of Ba0.55K0.45Fe1.95Co0.05As2 compared to ~75 T for Ba0.55K0.45Fe2As2 and BaFe1.8Co0.2As2 single crystals. Codoping thus is a promising way for the systematic optimization of iron-arsenic based superconductors for magnetic-field and high-current applications.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.