We consider the current-phase relation (CPR) in the Josephson junctions with complex insulator-superconductor-ferromagnetic interlayers in the vicinity of 0-π transition. We find a strong impact of the second harmonic on CPR of the junctions. It is shown that the critical current can be kept constant in the region of 0-pi transition, while the CPR transforms through multi-valued hysteretic states depending on the relative values of tunnel transparency and magnetic thickness. Moreover, CPR in the transition region has multiple branches with distinct ground states.
@article{arxiv.1703.04116,
title = {Current-phase relations in SIsFS junctions in the vicinity of 0-$\pi$ transition},
author = {S. V. Bakurskiy and V. I. Filippov and V. I. Ruzhickiy and N. V. Klenov and I. I. Soloviev and M. Yu. Kupriyanov and A. A. Golubov},
journal= {arXiv preprint arXiv:1703.04116},
year = {2017}
}