X-ray Characterizations of Iron-based Superconductor Round Wires with Large Critical Current Density

Abstract Characterizations of round wires iron-based superconductors were performed by using two different X-ray techniques. The core the wire turns out to be concentrically textured. texturing parameter ( r ) defined = I (002)/ (103) has a clear correlation with value critical current density J c wire. Using ~18 m-long (Ba, A )Fe 2 As : K, Na) wires, small magnets was constructed and successfully generated magnetic field as large 3.1 kOe at 53 A. for magnet carefully cut local variation evaluated. Variation area also measured tomography segments largest smallest . Obtained images demonstrates that certain degree sausaging effect it good minimum segment, record-high 71 kA/cm 100 been achieved.