Noise Spectroscopy Investigation of Interplay Between Quantum Interference Effects and Superconductivity in Infinite Layer Cuprates

作者：Barone C^*; Galdi A^*; Sacco C^*; Orgiani P^*; Schlom D G^*; Pagano S^*; Maritato L^*

来源：IEEE Transactions on Applied Superconductivity, 2016, 26(3): 7201204.

DOI：10.1109/TASC.2016.2540243

• Electric noise
• infinite layer superconductors
• metal-insulator transitions
• voltage fluctuations

The interplay between quantum interference effects and superconductivity has been investigated in infinite layer Sr1-xLaxCuO2 +/-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.

• 出版日期2016-4