Percolative supercurrent in superconductor–ferromagnetic insulator bilayers
A. Maiani, A. C. C. Drachmann, L. Galletti, C. Schrade, Y. Liu, R. Seoane Souto, S. Vaitiekėnas
DOI 10.1103/PhysRevB.111.174509 · Physical Review B
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Abstract
We report tunneling spectroscopy and transport measurements in superconducting Al and ferromagnetic insulator EuS bilayers. The samples display remanent spin splitting, roughly half the superconducting gap, and supercurrent transport above the average paramagnetic limit. We interpret this behavior as arising from the interplay between two characteristic length scales: the superconducting coherence length ξ and the magnetic domain size d. By comparing experimental results to a theoretical model, we find ξ/d≈10. In this regime, spin averaging across the micromagnetic configuration can locally suppress superconductivity, resulting in percolative supercurrent flow.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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