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• W2024862877 abstract "A charge current can flow between two superconductors separated by a thin barrier. This phenomenon is the Josephson effect, which enables a current to tunnel at zero voltage1, typically with no phase shift between the superconductors in the lowest-energy state. Recently, Josephson junctions with ground-state phase shifts of π, proposed by theory three decades ago2, have been demonstrated3,4,5. In superconducting loops, π-junctions cause spontaneous circulation of persistent currents in zero magnetic field2, in analogy to spin-1/2 systems6. Here we use a scanning superconducting quantum interference device microscope7 to image the spontaneous zero-field currents in superconducting networks of temperature-controlled π-junctions with weakly ferromagnetic barriers3. We find an onset of spontaneous supercurrents at the 0–π transition temperature of the junctions, Tπ≈3 K. We image the currents in non-uniformly frustrated arrays consisting of cells with even and odd numbers of π-junctions. Such arrays are attractive model systems for studying the exotic phases of the two-dimensional XY-model8,9 and achieving scalable adiabatic quantum computers10." @default.
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• W2024862877 date "2007-11-25" @default.
• W2024862877 modified "2023-10-16" @default.
• W2024862877 title "Imaging spontaneous currents in superconducting arrays of π-junctions" @default.
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• W2024862877 doi "https://doi.org/10.1038/nphys780" @default.
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