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Photoresponse of YBa2Cu3O(7-delta) granular and epitaxial superconducting thin filmsThe 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.
Document ID
19910065820
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Valco, G. J.
(Ohio State University Columbus, United States)
Claspy, P.
(Ohio State Univ. Columbus, OH, United States)
Warner, J. D.
(Ohio State Univ. Columbus, OH, United States)
Varaljay, N.
(Ohio State Univ. Columbus, OH, United States)
Bhasin, K. B.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Electronics And Electrical Engineering
Accession Number
91A50443
Funding Number(s)
CONTRACT_GRANT: NCC3-105
Distribution Limits
Public
Copyright
Other

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