Magnetic Flux Periodic Response of Nano-perforated Ultrathin Superconducting Films

Abstract

We have patterned a hexagonal array of nano-scale holes into a series of ultrathin, superconducting Bi/Sb films with transition temperatures 2.65 K $<T_{co}<$5 K. These regular perforations give the films a phase-sensitive periodic response to an applied magnetic field. By measuring this response in their resistive transitions, $R(T)$, we are able to distinguish regimes in which fluctuations of the amplitude, both the amplitude and phase, and the phase of the superconducting order parameter dominate the transport. The portion of $R(T)$ dominated by amplitude fluctuations is larger in lower $T_{co}$ films and thus, grows with proximity to the superconductor to insulator transition.

Revised title, abstract, text, figures

References in corpus (6)

• Superconductivity-Related Insulating Behavior
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• Spin-Polarized Tunneling in Critically Disordered Be-Al Bilayers