Title :
High current and pulse response of YBCO and BSCCO junctions
Author :
Zimmerman, G.O. ; Negm, Y.Z. ; Powers, R.E.
Author_Institution :
Dept. of Phys., Boston Univ., MA, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
One of the crucial elements in the use of HTS materials as current leads between 77 K and 4.2 K is the nature of their contact to normal and LTS metals. We report here a set of measurements made on junctions of polycrystalline YBCO and BSCCO bulk rods to copper wires. The surface area and the nature of the surface, as well as the method of making the junctions, influence the junction´s behavior. In a related measurement, high current short duration pulses were applied to HTS leads. It was found that the ability of the leads to withstand the stress of high current pulses depended on the previous history of the material.
Keywords :
barium compounds; bismuth compounds; calcium compounds; electrical contacts; high-temperature superconductors; strontium compounds; superconducting devices; superconducting junction devices; yttrium compounds; 4.2 to 77 K; BSCCO junction; BiSrCaCuO-Cu; HTS current lead; YBCO junction; YBaCuO-Cu; contact; copper wire; high current pulse response; polycrystalline bulk rod; surface area; Bismuth compounds; Contact resistance; Electrical resistance measurement; High temperature superconductors; Inorganic materials; Lead; Magnetic field measurement; Superconducting materials; Thermal conductivity; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
