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Proceedings Paper

Reversible modulation of superconductivity in YBa2Cu3O7-delta/polypyrrole sandwich structures
Author(s): Steven G. Haupt; David R. Riley; Jianai Zhao; Ji-Ping Zhou; James H. Grassi; John Thomas McDevitt
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Paper Abstract

The preparation of a hybrid conducting polymer/high-temperature superconductor device consisting of a polypyrrole coated YBa2Cu3O7-(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 YBa2Cu3O7-(delta ) film, the oxidized (conductive) polymer depresses Tc by up to 50 K. The observed reversible shifts in Tc are the largest reported to date. In a similar fashion, the oxidation state of the polymer is found to reversibly modulate the magnitude of Jc, the superconducting critical current. Thus, the operation of a molecular/superconductor switch for controlling superconductivity is demonstrated.

Paper Details

Date Published: 10 August 1994
PDF: 12 pages
Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); doi: 10.1117/12.182687
Show Author Affiliations
Steven G. Haupt, Univ. of Texas/Austin (United States)
David R. Riley, Univ. of Texas/Austin (United States)
Jianai Zhao, Univ. of Texas/Austin (United States)
Ji-Ping Zhou, Univ. of Texas/Austin (United States)
James H. Grassi, Univ. of Texas/Austin (United States)
John Thomas McDevitt, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 2158:
Oxide Superconductor Physics and Nano-Engineering
Davor Pavuna; Ivan Bozovic, Editor(s)

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