Tunneling attempts in single-phase Bi4Sr3Ca3Cu4O16+y and chemical doping on the Cu-sites in 90 and 40K superconductors

L. H. Greene, M. Girolid, B. G. Bagley, J. M. Tarascon, P. Barboux, P. F. Miceli, G. W. Hull

Research output: Contribution to journalArticlepeer-review


Planar tunneling junctions on Bi4Sr3Ca3Cu4O16+y (4334) which clearly exhibit the gap of the top electrode (In or Pb) have been prepared. Junction resistances range from 1Ω to 6kΩ over a 1 - 2mm2 area, the lower resistances being obtained only after plasma oxidation of the surface. We observe a linear conductance at varying biases above the gap region. No evidence of a gap in the 4334 material and no Josephson current has been observed even in the lowest resistance junctions. A short summary of the Bellcore work on the Cu-doped YBa2Cu3O7-y and La1.85Sr.15CuO4-y is also given.

Original languageEnglish (US)
Pages (from-to)896-897
Number of pages2
JournalPhysica C: Superconductivity and its applications
Issue numberPART 2
StatePublished - 1988

ASJC Scopus subject areas

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

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