The temperature dependence of the critical current in hysteretic Clarke junctions

Recently, Halse and Salleh analyzed the self-magnetic field behaviour in the pair current region of non-hysteretic Clarke solder blob junctions. In the resistive superconductive state, the individual junctions in the slug, (whether in the presence or in the absence of an external magnetic field) are liable to have influences of motion of quantised vortex rings. The temperature-dependent behaviour of the critical current in a zero magnetic field is presented from the present measurements on a solder-blob junction (using a lead-tin solder blob on a central wire of niobium). The curve is typical in showing an oscillatory behaviour different from that reported by Halse and Salleh. (Auth.)