0-$π$ phase shifts in Josephson junctions as a signature for the $s_{\pm}$-wave pairing state

Details 0-$π$ phase shifts in Josephson junctions as a signature for the $s_{\pm}$-wave pairing state 0-$π$ phase shifts in Josephson junctions as a signature for the $s_{\pm}$-wave pairing state

2009-01-13

arxiv.org/abs/0901.1895v2

Phys. Rev. B 80, 020503(R) (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures. Revised version with added results for ballistic limit. Accepted for publication in Phys. Rev. B - Rapid C

Scientific paper

We investigate Josephson junctions with superconducting ferropnictides, both in the diffusive and ballistic limit. We focus on the proposed $s_\pm$-wave state, and find that the relative phase shift intrinsic to the $s_\pm$-wave state may provide 0-$\pi$ oscillations in the Josephson current. This feature can be used to discriminate this pairing state from the conventional s-wave symmetry. The 0-$\pi$ oscillations appear both as a function of the ratio of the interface resistances for each band and, more importantly, as a function of temperature, which greatly aids in their detection.

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