Abstract
The intrinsic pair-breaking mechanisms in the superconducting metal films were investigated with respect to the fluctuation-induced conductivity (FIC) above the transition temperature. The tin and aluminum sample films were overdeposited with gold (about 1 atomic layer in averaged thickness). The measured FIC is well explained by the traditional superconducting theory with the pair-breaking parameter δ. The experimental relation δ=a+bRn□ holds, where Rn□ is the normal sheet resistance. The values of δ for gold-overdeposited samples are larger than those for unoverdeposited ones. This is considered to be due to the spin-orbit scattering effect owing to the existence of gold.
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