Investigation of the Interface Between a Normal Metal and High Temperature Superconductor
Data are presented on the contact resistance between YBCO and arc sprayed silver and copper. Contact resistivities of 3.4 × 10-7 Ωcm2 (Ag on YBCO) and 6 × 10-3 Ωcm2 (Cu on YBCO)) are obtained at 80K without annealing. With annealing, Ag on YBCO resistivities of 10-9 Ωcm2 are obtained. A new technique for measuring these very low contact resistances is outlined. Measurements on Cu and Ag spray coatings on a 10 molar% Ag on YBCO matrix were also carried out, the addition of Ag to YBCO reduced the Cu contact resistivity. These results are interpreted in terms of a percolative Ag path allowing current to bypass a degraded surface region of YBCO.
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- 7.S. P. Ashworth, C. Beduz, K. Harrison and Y. Yang, Electrical Contacts to YBCO using metal spray techniques. Cryogenics to be published.Google Scholar