Physics – Condensed Matter – Superconductivity
Scientific paper
2011-08-31
Physics
Condensed Matter
Superconductivity
6 pages, 4 figures, submitted to the proceedings of the 26th International Conference on Low Temperature Physics (LT-26)
Scientific paper
In 2010, several experimental groups obtained compelling evidence for spin-triplet supercurrent in Josephson junctions containing strong ferromagnetic materials. Our own best results were obtained from large-area junctions containing a thick central Co/Ru/Co "synthetic antiferromagnet" and two thin outer layers made of Ni or PdNi alloy. Because the ferromagnetic layers in our samples are multi-domain, one would expect the sign of the local current-phase relation inside the junctions to vary randomly as a function of lateral position. Here we report measurements of the area dependence of the critical current in several samples, where we find some evidence for those random sign variations. When the samples are magnetized, however, the critical current becomes clearly proportional to the area, indicating that the current-phase relation has the same sign across the entire area of the junctions.
Jr.
Birge Norman O.
Pratt William P.
Wang Yixing
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