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We study the emergent proximity effect in mesoscopic circuits that involve aconventional superconductor and an unconventional pnictide superconductorseparated by a diffusive normal or ferromagnetic wire. The focus is placed onrevealing signatures of the proposed s+- state of pnictides from theproximity-induced density of states and Josephson current. We find analyticallya universal result for the density of states that exhibits both the Thoulessgap at low energies, and peculiar features near the superconducting gap edgesat higher energies. The latter may be used to discriminate between s+- and s++symmetry scenarios in scanning tunneling spectroscopy experiments. We alsocalculate Josephson current-phase relationships for different junctionconfigurations, which are found to display robust 0-\pi transitions for a widerange of parameters.

Josephson current and density of states in proximity circuits with s+- superconductors