Study of planar MgB2/TiB2/MgB2 Josephson junctions using the proximity effect SNS model

Ke Chen, Y. Cui, Qi Li, X. X. Xi

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Planar MgB2/TiB2/MgB2 junctions were fabricated by locally removing MgB2 within a gap of ≤ 50 nm on a bilayer film of MgB2/TiB2 on SiC substrate using focused ion beam (FIB). Junctions with gaps of different depths were studied. We found that when the gap is too shallow the junction shows a flux-flow behavior, while a too deep gap will result In a junction with no supercurrent. Only junctions with the right gap depth exhibit good resistively-shunted-junction (RSJ) like current-voltage characteristics and excellent ac Josephson effect. The junctions' behavior can be described by the proximity effect superconductor-normal metal-superconductor (SNS) model, suggesting that the Josephson coupling is through the proximity effect in the metallic TiB 2 layer.

Original languageEnglish (US)
Pages (from-to)955-958
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
StatePublished - Jun 2007

All Science Journal Classification (ASJC) codes

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


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