Reversible modulation of superconductivity in YBa2Cu3O7-delta/polypyrrole sandwich structures

Steven G. Haupt; David R. Riley; Jianai Zhao; Ji-Ping Zhou; James H. Grassi; John Thomas McDevitt

doi:10.1117/12.182687

10 August 1994 Reversible modulation of superconductivity in YBa₂Cu₃O_7-δ/polypyrrole sandwich structures

Steven G. Haupt, David R. Riley, Jianai Zhao, Ji-Ping Zhou, James H. Grassi, John Thomas McDevitt

Proceedings Volume 2158, Oxide Superconductor Physics and Nano-Engineering; (1994) https://doi.org/10.1117/12.182687
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

The preparation of a hybrid conducting polymer/high-temperature superconductor device consisting of a polypyrrole coated YBa₂Cu₃O_7-(delta ) microbridge 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 YBa₂Cu₃O_7-(delta ) film, the oxidized (conductive) polymer depresses T_c by up to 50 K. The observed reversible shifts in T_c are the largest reported to date. In a similar fashion, the oxidation state of the polymer is found to reversibly modulate the magnitude of J_c, the superconducting critical current. Thus, the operation of a molecular/superconductor switch for controlling superconductivity is demonstrated.

Citation Download Citation

Steven G. Haupt, David R. Riley, Jianai Zhao, Ji-Ping Zhou, James H. Grassi, and John Thomas McDevitt "Reversible modulation of superconductivity in YBa₂Cu₃O_7-δ/polypyrrole sandwich structures", Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); https://doi.org/10.1117/12.182687

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