Abstract
Sandwich-type all-MgB2 Josephson tunnel junctions (MgB2∕AlOx∕MgB2) have been fabricated with as-grown MgB2 films formed by molecular-beam epitaxy. The junctions exhibit substantial superconducting current (IcRN product ∼0.8mV at 4.2 K), a well-defined superconducting gap (Δ=2.2–2.3mV), and clear Fraunhofer patterns. The superconducting gap voltage of Δ agrees well with the smaller gap in the multigap scenario. The results demonstrate that MgB2 has great promise for superconducting electronics that can be operated at T∼20K.
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