Phys. Rev. Lett. 71, 3007–3010 (1993)Direct spatial imaging of vortices in a superconducting wire networkReceived 14 June 1993; published in the issue dated 1 November 1993 We report direct observations of vortices in a square superconducting wire grid imaged using scanning Hall probe microscopy. Real space images of vortex configurations are obtained as a function of the flux per unit cell f by measuring the local magnetic field just above the sample. At f=1/2 we observe domains of the checkerboard ground state. As f is reduced from 1/2 to 1/3 vacancies first penerate the grain boundaries and then the checkerboard domains. Near f=1/3 we observe domains of the 1/3 staircase ground state. Heating the sample close to Tc produces correlated vortex hopping. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.3007
DOI:
10.1103/PhysRevLett.71.3007
PACS:
74.60.Ge, 61.16.Ch, 74.25.Ha, 74.80.-g
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