ANISOTROPY OF CRITICAL CURRENT-DENSITY IN THE SUPERCONDUCTING NB3SN TAPE WIRES

The value of critical density of current transported by Nb//3Sn superconductor in the perpendicular magnetic field is determined by the density of magnetic flux-pinning centers. The greatest differences in values of critical current density occur between the perpendicular and parallel orientation of the surface of superconducting Nb//3Sn tape wire in relation to the magnetic field strength vector. In this letter the results are presented of an investigation of perpendicular and parallel orientation in Nb//3Sn layers obtained in the process diffusion of tin atoms from liquid bronze solution Cu-80% Sn to the Nb-1. 5% Zr substrate.