Contacts with resistivities of 10 -8 Omega cm 2 or less, at temperatures below the T c of the underlying YBCO material, have been formed by incorporating gold wires into silver contact pads in a single heat treatment. Voltage-current characteristics of these contacts show superconducting behaviour. Microstructural cross-sections show an Ag/Au alloy with an Ag:Au atomic ratio of 3:1. Contacts made by applying wires after the silver heat treatment, which do not form an Ag/Au alloy, show residual resistances below T c of around 0.5-50 m Omega . Susceptibility and resistivity measurements were not suitable for critically differentiating between contact methods or treatment temperatures.
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Hollin et al. (1995) studied this question.
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