Commensurability effects induced by a periodic array of nanoscale anti-dots in Nb superconductor
A.A.Zhukov (1), E.T.Filby (1), P. A. J. de Groot (1), V.V.Metlushko, (2), B.Ilic (3) ((1) Department of Physics, Astronomy, University of, Southampton, Southampton, United Kingdom, (2) Department of Electrical and, Computer Engineering, University of Illinois at Chicago, Chicago
TL;DR
This study investigates how a periodic array of nanoscale holes in Nb superconductor influences vortex lattice behavior, revealing temperature-dependent effects and flux penetration mechanisms through magnetic and resistive measurements.
Contribution
It demonstrates the impact of nanoscale anti-dot arrays on vortex lattice commensurability and flux dynamics in superconducting Nb films, highlighting temperature-dependent interactions.
Findings
Flux jumps suppress commensurability anomalies at low temperatures
A peak near commensurate states 5-7 observed in measurements
Significant changes in flux penetration mechanism at this point
Abstract
We study the interactions of the vortex lattice with a periodic square array of holes in a superconducting Nb film using magnetic and resistive measurements. Three different temperature regions have been observed. They are governed by interplay between vortex-vortex interactions and pinning by holes. At low temperatures flux jumps suppress the commensurability anomalies. In all measurements a peak has been observed close to commensurate states 5-7. The Cole-Cole plot reveals significant changes in the flux penetration mechanism at this point.
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