Fractional-flux Little-Parks resistance oscillations in disordered superconducting cylinders
Department of Physics, The Pennsylvania State University
University Park, PA 16802, USA
Accepted: 27 June 2001
The resistance of disordered superconducting Au0.7In0.3 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 units 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.
PACS: 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.76.Db – Conventional superconducting films
© EDP Sciences, 2001