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All-MgB2 Josephson tunnel junctions

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arxiv cond-mat/0412345 v1 pith:UR3IVCT6 submitted 2004-12-14 cond-mat.supr-con cond-mat.mtrl-sci

All-MgB2 Josephson tunnel junctions

K. Ueda , S. Saito , K. Semba , T. Makimoto , M. Naito This is my paper
classification cond-mat.supr-con cond-mat.mtrl-sci
keywords mgb2superconductingjunctionsall-mgb2deltajosephsontunnelagrees
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Sandwich-type all-MgB2 Josephson tunnel junctions (MgB2/AlOx/MgB2) have been fabricated for the first time with as-grown MgB2 films formed by molecular beam epitaxy. The junctions exhibit substantial superconducting current (IcRN product ~ 0.8 mV at 4.2K), a well-defined superconducting gap (delta = ~2.3 mV), and clear Fraunhofer patterns. The superconducting gap voltage of delta agrees well with the smaller gap in the multi-gap scenario. The results demonstrate that MgB2 has great promise for superconducting electronics that can be operated at T ~ 20 K.

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