Abstract
The interplay between quantum interference effects and superconductivity has been investigated in infinite layer $\text{Sr}_{1-x}\text{La}_{x}\text{CuO}_{2\pm\delta}$ thin films by using a combination of standard dc electric transport measurements and noise characterization. A marked resistivity upturn at a temperature of 110 K has been observed in underdoped samples, which also showed a superconductive transition at about 25 K. The resistivity behavior has been attributed to weak localization and has been investigated by detailed low-frequency voltage-spectral density measurements. In particular, peculiar linear dependence of the $1/f$ noise on the bias current is found in the weak-localization regime, whereas the usual quadratic dependence of the $1/f$ component occurs in the superconducting and metallic regions.
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