Size Effect and Critical Transport Current in Titanium (22 at.% Niobium)

Abstract

The dependence of the critical transport current density on conductor size has been measured for the superconductor, Ti (22 at.% Nb), in transverse fields up to 93 kG. For samples with as similar metallurgical histories as possible, it is found that the critical current is proportional to the cross‐sectional area for samples 0.0024 in. to 0.0501 in. in diameter. More important, the field‐dependence found for critical current densities is given by $$J_c{\mathrm{=A}}_0{\mathrm{/b}}_0\hspace{0.17em}\exp {\mathrm{(-B/b}}_0{\mathrm{)+C}}_0$$ , where B is the applied transverse magnetic field.