All-MgB2 Josephson tunnel junctions

Details All-MgB2 Josephson tunnel junctions All-MgB2 Josephson tunnel junctions

2004-12-14

arxiv.org/abs/cond-mat/0412345v1

Published in Appl. Phys. Lett., 86 (2005) 172502

Physics

Condensed Matter

Superconductivity

9 pages, 3 figures

Scientific paper

10.1063/1.1920411

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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