Tunnel junctions on as-grown superconducting MgB2 thin films

K. Ueda*, M. Naito

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

13 Citations (Scopus)


We demonstrate that good superconductor/insulator/ normal-metal tunnel junctions can be fabricated on as-grown superconducting MgB2 thin films. The as-grown films were prepared by coevaporation at low growth temperatures of around 280° C. The insulating barrier was formed by an Mg overlayer, which is subsequently oxidized in air. The tunneling spectra for Au/MgOx,/MgB2 junctions showed a reproducible and well-defined superconducting gap (Δ =∼ 2.5 meV). The resultant 2Δ/kBTc was significantly smaller than the predicted BCS value of 3.52.

Original languageEnglish
Pages (from-to)3249-3252
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 III
Publication statusPublished - 2003 Jun
Externally publishedYes
Event2002 Applied Superconductivity Conference - Houston, TX, United States
Duration: 2002 Aug 42002 Aug 9


  • As-grown
  • In-situ annealing
  • MgB
  • Superconducting gap
  • Thin films
  • Tunnel junctions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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