Fractional-flux Little-Parks resistance oscillations in disordered superconducting Au${}_{0.7}$In${}_{0.3}$ cylinders

Abstract

Resistance of disordered superconducting Au${}_{0.7}$In${}_{0.3}$ cylindrical films was measured as a function of applied magnetic field. In the high-temperature part of the superconducting transition regime, the resistance oscillated with a period of $h/2e$ in the unit of the enclosed magnetic flux. However, at lower temperatures, the resistance peaks split. We argue that this splitting is due to the emergence of an oscillation with a period of $h/4e$, half of the flux quantum for paired electrons. The possible physical origin of the $h/4e$ resistance oscillation is discussed in the context of new minima in the free energy of a disordered superconducting cylinder.

8 pages with figures, published in Europhys. Lett

References in corpus (3)

• Phase coherent transport in hybrid superconducting nanostructures
• Density of States in Superconductor - Normal Metal - Superconductor Junctions
• A novel superconducting glass state in disordered thin films in Clogston limit

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• Onset of surface superconductivity beyond the Saint-James-de Gennes limit
• Observation of large $h/2e$ and $h/4e$ oscillations in a proximity dc superconducting quantum interference device
• Quantum fluctuations of charge and phase transitions of a large Coulomb-blockaded quantum dot
• Structural and electrical transport properties of superconducting Au{0.7}In{0.3} films: A random array of superconductor-normal metal-superconductor (SNS) Josephson junctions
• Quantum magnetoresistive (hc/2e)/m periodic oscillations in a superconducting ring
• A New Interpretation of Flux Quantization