0-pi transitions in Josephson junctions with antiferromagnetic interlayers

Physics – Condensed Matter – Superconductivity

Scientific paper

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4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.96.117005

We show that the dc Josephson current through superconductor-antiferromagnet-superconductor (S/AF/S) junctions manifests a remarkable atomic scale dependence on the interlayer thickness. At low temperatures the junction is either a 0- or pi-junction depending on whether the AF interlayer consists of an even or odd number of atomic layers. This is associated with different symmetries of the AF interlayers in the two cases. In the junction with odd AF interlayers an additional pi-0 transition can take place as a function of temperature. This originates from the interplay of spin-split Andreev bound states. Experimental implications of these theoretical findings are discussed.

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