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Pure 2nd harmonic current phase relation in Spin filter Josephson junctions

Higher harmonics in current phase relations of Josephson Junctions (JJs) are predicted to be observed when the first harmonic is suppressed. Conventional theoretical models predict higher harmonics to be extremely sensitive to changes in barrier thickness, temperature, etc. In contrast, experiments with JJs incorporating a spin dependent tunnelling barrier reported here reveal a current phase relation for highly spin polarized barriers which is purely 2nd harmonic in nature, and this is insensitive to changes in barrier thickness. This observation is consistent with recent theoretical predictions of a robust 2nd harmonic current phase relation for certain JJs with ferromagnetic barriers and implies that the standard theory of Cooper pair transport through tunnelling barriers is not applicable for spin dependent tunnelling barriers.

preprint2014arXivOpen access
Avradeep PalZ. H. BarberJ. W. A. RobinsonM. G. Blamire
cond-mat.supr-con
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Avradeep PalZ. H. BarberJ. W. A. RobinsonM. G. Blamire

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