Influence of vortex-lattice melting on the resistive properties of a superconducting thin-film transformer

The current-voltage curve of a transformer (the dependence of the secondary voltage V2 on the transport current I1 in the primary circuit) has been calculated for two-dimensional vortex-lattice melting. It is shown that even in the critical temperature range the I-V curve loses its root singularity characteristic of a transformer operating in the standard mode. When the lattice is completely melted, the maximum of the V2(I1) curve shifts to higher currents while V2 is much lower than the primary voltage V1, at any value of I1. All of this makes it possible to study vortex-lattice melting using a superconducting transformer. We compare our calculated I-V curve with that obtained experimentally by Tarenkov et al.8

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