Metastable $π$-junction between an s$_\pm$-wave and an s-wave superconductor

Details Metastable $π$-junction between an s$_\pm$-wave and an s-wave superconductor Metastable $π$-junction between an s$_\pm$-wave and an s-wave superconductor

2011-01-31

arxiv.org/abs/1102.0042v3

Phys. Rev. Lett. 106, 147003 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures; Published version

Scientific paper

10.1103/PhysRevLett.106.147003

We examine a contact between a superconductor whose order parameter changes sign across the Brillioun zone, and an ordinary, uniform-sign superconductor. Within a Ginzburg-Landau type model, we find that if the the barrier between the two superconductors is not too high, the frustration of the Josephson coupling between different portions of the Fermi surface across the contact can lead to surprising consequences. These include time-reversal symmetry breaking at the interface and unusual energy-phase relations with multiple local minima. We propose this mechanism as a possible explanation for the half-integer flux quantum transitions in composite niobium--iron pnictide superconducting loops, which were discovered in a recent experiment [Chen et al., Nature Phys. \textbf{6},260 (2010)].

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