Reversible modulation of superconductivity in YBa2Cu3O7 Ipolypyrrole sandwich structures

Steven G. Haupt, David R. Riley, Jianai Zhao, Ji Ping Thou, James H. Grassi, John T. McDevitt

Research output: Contribution to journalConference articlepeer-review


The preparation of a hybrid conducting polymer/high-Temperature superconductor device consisting of a polypyrrole coated YBa2Cu3O7-6 microiridge is reported. Electrochemical techniques are exploited to alter the oxidation state of the polymer and, in doing so, it is found that superconductivity can be modulated in a controllable and reproducible fashion by the polymer layer. Whereas the neutral (insulating) polypyrrole only slightly influences the electrical properties of the underlying YBa2Cu3O7 film, the oxidized (conductive) polymer depresses Tc by up to 50K. The observed reversible shifts in Tc are the largest reported to date. In a similar fashion, the oxithtion state of the polymer is found to reversibly modulate the magnitude of J, the superconducting critical current. Thus, the operation of a molecular/superconductor switch for controlling superconductivity is demonstrated.

Original languageEnglish (US)
Pages (from-to)238-249
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Aug 10 1994
EventOxide Superconductor Physics and Nano-Engineering 1994 - Los Angeles, United States
Duration: Jan 23 1994Jan 29 1994

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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