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    Nano Josephson superconducting tunnel junctions in YBa2Cu3O7–δ directly patterned with a focused helium ion beam

    High-quality superconducting tunnel junctions operating above liquid nitrogen temperatures can be fabricated with a focused beam of helium ions that directly writes tunnel barriers in a cuprate superconductor.

    Shane A. Cybart, E. Y. Cho, T. J. Wong, Björn H. Wehlin… in Nature Nanotechnology (2015)