Preparation and Properties of Thin-Film Hard Superconductors

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Abstract
Films of thickness the order of 1000 Å of Nb‐Zr, Nb‐Ti, Ti‐V, V‐Si, Nb‐Sn, and Nb have been prepared by dc sputtering and by electron bombardment evaporation. Measurement of the critical currentJc as a function of external magnetic fieldH was carried out at 4.2°K by using pulsed magnetic fields and pulsed currents. The films have Jc vs H characteristics and transition temperatures very similar to those reported for bulk hard superconductors. An exception was the sputter‐deposited Nb,Tc ≈9°K, which was superconducting at 70 kOe and 103 A/cm2. More structure was observed in the Jc vs H characteristic for longitudinal configuration than previously reported.