Josephson properties of Nb film bridges with controllable critical current
A. LukashenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovA. A. ShabloPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovС. И. БондаренкоPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Kharkov
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The current–voltage characteristics and the temperature dependences of the critical current and normal resistance have been studied on thin-film niobium bridges, obtained by a controlled application of current pulses to the bridge. Bridges with critical currents Ic ≲ 100 μ A are shown to possess very distinct Josephson properties. A planar de SQUID with a flux resolution of δΦ ≃ l.l · 10−4Φ0/Hz1/2 has been fabricated.
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