Low-resistance silver contact on Bi-Sr-Ca-Cu-O film

Abstract

A simple method of making low-resistivity contacts ( approximately 10-7 Omega cm2) is reported for the first time on Bi-Sr-Ca-Cu-O films. The method basically involves the laying of silver-paste pads on the surface of as-deposited film, their annealing and the subsequent attachment of copper leads. The annealing step thus serves a dual purpose. It not only renders the film superconducting with requisite oxygenation but also helps in the preparation of low-resistivity contacts. The contacts on the film are quite rugged and could withstand several thermal cyclings between 4.2 and 300 K over a period of one month.

Ion beam and thermally-induced interface reaction between highT c superconductor thin film and metal overlayer

“…In our case, the grazing angle of incidence of 0.6 ° (critical angle for silver = 0.46 °) was selected to probe the Ag/YBaCuO interface. The electrical measurements were carried out by employing the three-probe configuration (Khare et al 1989) shown in figure 1, so as to obtain the contact resistance. Four-probe measurement was also made to obtain the precise R vs T data above Tc onset.…”