Effect of linear defects on the field distribution in thin superconductors

Mahesh Chandran

doi:10.1103/PhysRevB.57.3609

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Effect of linear defects on the field distribution in thin superconductors

Mahesh Chandran

DOI 10.1103/PhysRevB.57.3609 · Physical Review B

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Abstract

A two-dimensional Josephson-junction array with linear defects is simulated to probe the influence of twin boundaries on the magnetic-field distribution in a thin superconductor in a transverse magnetic field. The simulation was carried out for varying pinning potentials α of the defect, and for different orientations θd of the defect relative to the external boundary. For α<1 (weak pinning), the defect behaves as an easy channel for longitudinal motion of the vortices, whereas transverse motion across the defect is hindered due to vortices within the defect channel. For intermediate angle θd, a gliding motion outside the fore-edge (edge facing the interior of the array) of the defect is observed. For α>1, the defect acts as a barrier for transverse as well as longitudinal motion of the vortices, resulting in an increased vortex density in the wake of the defect for intermediate values of θd.