Doping dependence of critical current properties of 122-type iron-based superconductors

摘要

The iron-based superconductors discovered in 2008 [1] are promising material for high-field magnet applications because of their large upper critical fields (H_(c2) > 100 T) with small anisotropy (γ~ ～ 1-2). Indeed, the superconducting wires/tapes have been fabricated by the powder-in-tube method using iron-based superconductors [2]. Because the superconducting properties of iron-based superconductors depend on the chemical compositions (or doping levels), the knowledge of doping dependence of the critical current properties will become necessary for further improvement in the performance of wires. In this work, we investigate the doping dependence of critical current properties of doped-BaFe_2As_2 single crystals.