Realization of the π-state in junctions formed by multiband superconductors with a spin density wave

Andreas Moor; Anatoly F. Volkov; Konstantin B. Efetov

doi:10.1103/PhysRevB.87.100504

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Realization of the π-state in junctions formed by multiband superconductors with a spin density wave

Andreas Moor, Anatoly F. Volkov, Konstantin B. Efetov

DOI 10.1103/PhysRevB.87.100504 · Physical Review B

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Abstract

Using a simple model of multiband superconductors, which can be applied in particular to Fe-based pnictides, we calculate the Josephson current IJ in a tunnel junction composed by such superconductors. We employ the tunneling Hamiltonian method and quasiclassical Green's functions. We study both the case of coexistence of the superconducting (Δ) and magnetic (SDW—spin density wave) order parameters and the case when only the superconducting order parameter exists. We show that the current IJ depends on the mutual orientation of magnetization of the SDW in the case of nonideal nesting when the coexistence of superconducting and magnetic order parameters is possible as it takes place in Fe-based pnictides. It is found that the realization of the π junction is possible in both cases. We compare our results for multiband superconductors without the SDW with those obtained earlier and find that they coincide if the tunneling matrix elements are real. If these elements are complex, a new term appears in the formula for the Josephson critical current.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown