CHARACTERIZATION OF AG BI2SR2CAN-1CUNO2N+4 INTERFACIAL RESISTIVITY/

Silver contacts to single-crystal Bi(2)Sr(2)CaCu(2)Ox (Bi-2212) and po lycrystalline (Bi,Pb)(2)Sr2Ca2Cu3Ox (Bi-2223) were prepared by sputter ing or sinter-forging techniques. The interfacial resistivity of Ag/Bi -2212, defined as interfacial resistance times contact area, decreased from 10(-4) to 10(-10) Ohm cm(2) at 77 K when the thermal annealing t ime increased from 1 to 14 h at 600 degrees C; it was also a function of the annealing temperature. The lowest interfacial resistivity of Ag /Bi-2223 that was sinter-forged at 840-845 degrees C for 1 h was 10(-9 ) Ohm cm(2) at 77 K. Experimental data are compared with intrinsic int erfacial resistivity and resistivity values found in the literature.