Abstract
We have investigated in detail the influence of a small perpendicular field on the observation of the superconducting phase transition of Josephson-tunnel junction arrays with linear and nonlinear resistance measurements. We find that even a small residual field strongly enhances the crossing of single vortices. In the linear resistance these single-vortex processes dominate over the pairunbinding effects just above and below the Kosterlitz-Thouless temperature. Also, through single-vortex processes, the jump in the nonlinear resistance exponent can be washed out in a field, depending on the cell size and the array width.
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van der Zant, H.S.J., Rijken, H.A. & Mooij, J.E. The superconducting transition of 2-D Josephson-junction arrays in a small perpendicular magnetic field. J Low Temp Phys 79, 289–310 (1990). https://doi.org/10.1007/BF00682288
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DOI: https://doi.org/10.1007/BF00682288