Dependence of the critical-current density on the grain dimension in polycrystalline niobium
Vinnikov L.Ya., Zharikov O.V., Kopetskii Ch.P., Shiyanova E.N.
An exponential dependence of the critical current density on the reciprocal of the grain dimension was obtained for polycrystal-line niobium with grains ranging from 100 to 10 microns.