Local imaging of diamagnetism in proximity coupled niobium nano-island arrays on gold thin films
arXiv:2208.09084 · doi:10.1103/PhysRevB.106.054521
Abstract
In this work we study the effect of engineered disorder on the local magnetic response of proximity coupled superconducting island arrays by comparing scanning Superconducting Quantum Interference Device (SQUID) susceptibility measurements to a model in which we treat the system as a network of one-dimensional (1D) superconductor-normal metal-superconductor (SNS) Josephson junctions, each with a Josephson coupling energy determined by the junction length or distance between islands. We find that the disordered arrays exhibit a spatially inhomogeneous diamagnetic response which, for low local applied magnetic fields, is well described by this junction network model, and we discuss these results as they relate to inhomogeneous two-dimensional (2D) superconductors. Our model of the static magnetic response of the arrays does not fully capture the onset of nonlinearity and dissipation with increasing applied field, as these effects are associated with vortex motion due to the dynamic nature of the scanning SQUID susceptometry measurement. This work demonstrates a model 2D superconducting system with engineered disorder and highlights the impact of dissipation on the local magnetic properties of 2D superconductors and Josephson junction arrays.
arXiv commentMain text: 9 pages, 5 figures. Supplementary material: 11 pages, 12 figures. Accepted to Phys. Rev. B. The first two authors contributed equally
References in corpus (19)
- Defects in correlated metals and superconductors
- Nature of the superconductor-insulator transition in disordered superconductors
- The Josephson critical current in a long mesoscopic S-N-S junction
- Remarkable effects of disorder on superconductivity of single atomic layers of lead on silicon
- Approaching Zero-Temperature Metallic States in Mesoscopic Superconductor-Normal-Superconductor Arrays
- Scanning SQUID susceptometers with sub-micron spatial resolution
- Flux penetration and expulsion in thin superconducting disks
- Survival of superconducting correlations across the 2D superconductor-insulator transition: A finite frequency study
- Thin superconductors and SQUIDs in perpendicular magnetic field
- Scanning SQUID Susceptometry of a paramagnetic superconductor
- Unconventional disorder effects in correlated superconductors
- Broadening of the Berezinskii-Kosterlitz-Thouless transition by correlated disorder
- The High-Field Superconducting Transition induced by Correlated Disorder
- Direct visualization of phase-locking of large Josephson junction arrays by surface electromagnetic waves
- Imaging and controlling vortex dynamics in mesoscopic superconductor-normal-metal-superconductor arrays
- Meissner response of superconductors with inhomogeneous penetration depths
- Agreement between local and global measurements of the London penetration depth
- Theory of the lower critical magnetic field for a two-dimensional superconducting film in a non-uniform field
- Fate of global superconductivity in arrays of long SNS junctions