Multifilamentary oxide superconducting wire and method of producing the same, and stranded oxide superconducting wire and method of producing the same

摘要

A multifilamentary oxide superconducting wire (10) having a low aspect ratio and a relatively high critical current density, and being suitable for a stranded wire (30), is provided. In order to produce such a wire, a tape-shaped, multifilamentary oxide superconducting wire (70) prepared by the powder-in-tube process is cut along its length. The resulting multifilamentary oxide superconducting wires (10) have a width smaller than that of the tape-shaped wire (70). The resulting wires typically have an aspect ratio of one to two. The filaments (12) of the resulting wires are in the shape of a ribbon extending in the longitudinal direction, and arranged substantially parallel to each other and in layers. The filaments have an aspect ratio greater than two. The filaments include a filament (12a,b,c) having a portion substantially not covered with the stabilizer (11).