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Local imaging of diamagnetism in proximity-coupled niobium nanoisland arrays on gold thin films

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [3];  [3];  [5];  [6];  [3];  [3];  [2];  [7]
  1. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  3. Univ. of Illinois, Urbana, IL (United States)
  4. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Stanford Univ., CA (United States)
  6. Univ. of Colorado, Boulder, CO (United States)
  7. Univ. of Connecticut, Storrs, CT (United States)
+ Show Author Affiliations
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 Josephson junctions, each with a Josephson coupling energy $$E_J$$ 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 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. Furthermore, this work demonstrates a model 2D superconducting system with engineered disorder, and it highlights the impact of dissipation on the local magnetic properties of 2D superconductors and Josephson junction arrays.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States). Stanford Institute for Materials and Energy Sciences
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0021238
OSTI ID:
1884554
Alternate ID(s):
OSTI ID: 1902701
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AC susceptibility measurement
BKT transition
Josephson effect
Josephson junction
SQUID
coherence length
critical current
diamagnetism
proximity effect
scanning probe microscopy
superconductor
superfluid density
susceptibility
thin films