Transport in superconductor/ferromagnet/superconductor junctions dominated by interface resistance
O. Bourgeois, P. Gandit, A. Sulpice, J. Chaussy, J. Lesueur, X. Grison
DOI 10.1103/PhysRevB.63.064517 · Physical Review B
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Abstract
We report on high-sensitivity measurements performed on weakly resistive Nb/Al/Gd/Al/Nb ferromagnetic rare-earth-based junctions. High interface barriers in such junctions can strongly modify interplay between ferromagnetism and superconductivity. We show in the present paper that for such ferromagnetic/superconductor junctions that the main contribution to the resistance comes from interface scattering. On the other hand, measurements on identical nonmagnetic rare-earth-based junctions such as Nb/Al/Y/Al/Nb exhibit opposite behavior; hence most resistance comes from the bulk. A theoretical description of the temperature dependence of the superconductor/ferromagnet/superconductor (S/F/S) junction resistance is given through a temperature dependent Blonder-Tinkham-Klapwick theory for an energy range well below the superconducting gap scale of the Al/Nb bilayer. Such a theoretical description proves that interfacial scattering is of crucial importance when experimenting in S/F systems using gadolinium.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.6 | Pressure not reported | onset |
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