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Proceedings Paper

Organic conductor/high-Tc superconductor bilayer structures
Author(s): Marvin B. Clevenger; Christopher E. Jones; Steven G. Haupt; Jianai Zhao; John Thomas McDevitt
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Paper Abstract

Electrochemical techniques are exploited to fabricate conductive polymer/high Tc superconductor bilayer structures. SCanning electron microscopy and electrochemical techniques are utilized to characterize the electrodeposition of polypyrrole layers grown onto YBa2Cu3O7-(delta ) films. In such hybrid polymer/superconductor systems, it is found that when the polymer is oxidized to its conductive state, the transition temperatures (Tc) and critical currents (Jc) of the underlying superconductor film are suppressed. Reversible modulation of the values of the transition temperatures of up to 50K are noted for these structures. Upon reduction of the conductive polymer layer back to its non-conductive form, both Tc and Jc are found to return to values close to those acquired for the underivatized YBa2Cu3O7-(delta ) film. Moreover, measurements as a function of temperature of the polymer/superconductor interface resistance show dramatic decrease in this value at Tc. ALso, estimates of superconducting coherence lengths within the organic conductor samples suggest superconducting properties over macroscopically large distances within the organic materials can be expected. Collectively these results are consistent with the first observation of a conductive polymer proximity effect.

Paper Details

Date Published: 5 July 1996
PDF: 12 pages
Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250265
Show Author Affiliations
Marvin B. Clevenger, Univ. of Texas/Austin (United States)
Christopher E. Jones, Univ. of Texas/Austin (United States)
Steven G. Haupt, Quantum Magnetics (United States)
Jianai Zhao, Univ. of Texas/Austin (United States)
John Thomas McDevitt, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 2697:
Oxide Superconductor Physics and Nano-Engineering II
Ivan Bozovic; Davor Pavuna, Editor(s)

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