Physics – Condensed Matter – Superconductivity
Scientific paper
2011-11-23
Physics
Condensed Matter
Superconductivity
5 pages, 3 figures
Scientific paper
We study the transport properties of nanoscale superconducting (S) devices in which two superconducting electrodes are bridged by two parallel ferromagnetic (F) wires, forming an SFFS junction with a separation between the two wires and between the two electrodes less than the superconducting coherence length. We find that the resistance exhibits re-entrant behavior as a function of temperature and, at low temperatures and excitation energies below the superconducting gap, the resistance corresponding to antiparallel alignment of the magnetization of the ferromagnetic wires is higher than that of parallel alignment, in contrast to previous experimental and theoretical work on junctions of such geometry. We present a model based on spin-dependent interface scattering that explains this surprising result and demonstrates the sensitivity of the junction transport properties to interfacial parameters.
Colci Madalina
Shah Nayana
Sun Kuei
Van Harlingen Dale J.
Vishveshwara Smitha
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