All-MgB2 Josephson tunnel junctions

K. Ueda*, S. Saito, K. Semba, T. Makimoto, M. Naito

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)


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 (Ic RN product ~0.8 mV at 4.2 K), a well-defined superconducting gap (Δ=2.2-2.3 mV), 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~20 K.

Original languageEnglish
Article number172502
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number17
Publication statusPublished - 2005 Apr 25
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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