Year: 2013
Type: article
Abstract: We demonstrate evidence of coherent magnetic flux tunneling through superconducting nanowires patterned in a thin highly disordered NbN film. The phenomenon is revealed as a superposition of flux states in a fully metallic superconducting loop with the nanowire acting as an effective tunnel barrier for the magnetic flux, and reproducibly observed in different wires. The flux superposition achieved in the fully metallic NbN rings proves the universality of the phenomenon previously reported for ${\mathrm{InO}}_{x}$. We perform microwave spectroscopy and study the tunneling amplitude as a function of the wire width, compare the experimental results with theories, and estimate the parameters for existing theoretical models.
Source: Physical Review B
Institutions: RIKEN Center for Emergent Matter Science, NEC (Japan), University of London, Royal Holloway University of London, Moscow State Pedagogical University, National Research University Higher School of Economics, Moscow Institute of Physics and Technology, Rutgers, The State University of New Jersey, Delft University of Technology
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2134253227