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Higher harmonics in current phase relations of Josephson Junctions (JJs) arepredicted to be observed when the first harmonic is suppressed. Conventionaltheoretical models predict higher harmonics to be extremely sensitive tochanges in barrier thickness, temperature, etc. In contrast, experiments withJJs incorporating a spin dependent tunnelling barrier reported here reveal acurrent phase relation for highly spin polarized barriers which is purely 2ndharmonic in nature, and this is insensitive to changes in barrier thickness.This observation is consistent with recent theoretical predictions of a robust2nd harmonic current phase relation for certain JJs with ferromagnetic barriersand implies that the standard theory of Cooper pair transport throughtunnelling barriers is not applicable for spin dependent tunnelling barriers.

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