δ-biased Josephson tunnel junctions
R. Monaco, J. Mygind, V. P. Koshelets, P. Dmitriev
DOI 10.1103/PhysRevB.81.054506 · Physical Review B
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Abstract
The behavior of a long Josephson tunnel junction drastically depends on the distribution of the dc bias current. We investigate the case in which the bias current is fed in the central point of a one-dimensional junction. Such junction configuration has been recently used to detect the persistent currents circulating in a superconducting loop. Analytical and numerical results indicate that the presence of fractional vortices leads to remarkable differences from the conventional case of uniformly distributed dc bias current. The theoretical findings are supported by detailed measurements on a number of δ-biased samples having different electrical and geometrical parameters.
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