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Proceedings Paper

Photoresponse of YBa2Cu3O7-delta granular and epitaxial superconducting thin films
Author(s): George J. Valco; Paul C. Claspy; Joseph D. Warner; Nicholas C. Varaljay; Kul B. Bhasin
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Paper Abstract

The response is reported of thin films of YBa2Cu3O(7-delta) with either a very grainy or a smooth epitaxial morphology to visible radiation. SrTiO3 substrates were employed for both types of films. The grainy films were formed by sequential multi-layer electron beam evaporation while the epitaxial films were formed by laser ablation. Both films were patterned into H shaped detectors via a negative photolithographic process employing a Br/ethanol etchant. The bridge region of the H was 50 microns wide. The patterned films formed by laser ablation and sequential evaporation had critical temperatures of 74 K and 72 K respectively. The bridge was current biased and illuminated with chopped He-Ne laser radiation and the voltage developed in response to the illumination was measured. A signal was detected only above the critical temperature and the peak of the response coincided with the resistive transition for both types of films although the correspondence was less exact for the grainy film. The details of the responses and their analysis are presented.

Paper Details

Date Published: 1 October 1990
PDF: 10 pages
Proc. SPIE 1292, Superconductivity Applications for Infrared and Microwave Devices, (1 October 1990); doi: 10.1117/12.21042
Show Author Affiliations
George J. Valco, Ohio State Univ. (United States)
Paul C. Claspy, NASA/Lewis Research Ctr. (United States)
Joseph D. Warner, NASA/Lewis Research Ctr. (United States)
Nicholas C. Varaljay, NASA/Lewis Research Ctr. (United States)
Kul B. Bhasin, NASA/Lewis Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1292:
Superconductivity Applications for Infrared and Microwave Devices
Kul B. Bhasin; Vernon O. Heinen, Editor(s)

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