摘要：Improvement of the critical current density (J c ) of superconducting wires/tapes is one of the key issues in the field of superconductivity applications. Here we report the fabrication of a silver-sheathed Ba 1-x Na x Fe 2 As 2 (BaNa-122) superconducting tape by using a powder-in-tube technique and its superconducting properties, in particular transport J c , as well as the tape-core texture. The optimally-doped BaNa-122 tape with Na concentration x = 0.4 exhibits the superconducting critical temperature (T c ) of 33.7 K and high transport J c of 4 × 10 4 A/cm 2 at 4.2 K in a magnetic field of 4 T. Patterns of x-ray diffraction for the superconducting core show that the degree of c-axis orientation is significantly enhanced through the tape fabrication process. The tendency of c-axis orientation is advantageous for achieving higher J c , suggesting the high potential of BaNa-122 for superconducting wire/tape applications.
