understand the invention reference should be had to the following description and example taken in conjunction with the attached drawings wherein fig1 shows the schematic design of a monofilament billet containing superconducting alloy sheets in accordance with the invention and fig2 shows the schematic design of a multifilament billet that utilizes the monofilament fabricated in accordance with the invention in the production of fine filament superconducting wire the current practice is to fabricate a monofilamentary wire from which multifilamentary wire is subsequently fabricated through the performance of one or more restacking operations the monofilamentary wire is produced from a billet that generally consists of three elements a superconducting alloy ingot a barrier material which is in the form of sheet that is wrapped around the ingot and a copper extrusion can that surrounds both the barrier and the ingot in the present invention a fourth element is added a series of fine grained astm micro grain number gt 8 sheets of superconducting material situated between the barrier sheets and the ingot see fig1 these superconducting sheets reduce the degree of surface irregularity at the interface between the diffusion barrier and the ingot and are also believed to increase j c by virtue of the increased magnetic flux pinning afforded by both the finer grain structure in.