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Proceedings Paper

Superconducting YBa2Cu3O7 bolometer on polycrystalline diamond
Author(s): Laxminarayana Ganapathi; Jim P. Zheng; Steven E. Giles; Rama Rao; HoiSing Kwok
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Paper Abstract

We have deposited superconducting YBCO (YBa2Cu3O7) thin films on polycrystalline diamond using a composite Si/YSZ (yttria stabilized zirconia) diffusion barrier. 10 - 20 micron thick, free standing diamond films were coated with a micron thick layer of amorphous Si by plasma CVD. This was vacuum annealed at 700 degree(s)C to crystallize Si prior to the in-situ deposition of YSZ and YBCO by laser ablation. A primary layer of Si was found essential to avoid the peeling of the multilayer structure during the cooling of the substrates. A Tc-zero equals 50 K was observed for the best films. A bolometer fabricated from this film exhibited a 18 V/W responsivity and NEP equals 6.3 X 10-9 W/(root)Hz at 60 K. Both the buffer layers and YBCO were polycrystalline. We believe single crystal Si backing CVD grown diamond can be used instead of a polycrystalline Si layer to further improve the quality of the YBCO deposited on polycrystalline diamond.

Paper Details

Date Published: 20 May 1994
PDF: 7 pages
Proc. SPIE 2159, High-Temperature Superconducting Detectors: Bolometric and Nonbolometric, (20 May 1994); doi: 10.1117/12.176149
Show Author Affiliations
Laxminarayana Ganapathi, Excel Superconductor, Inc. (United States)
Jim P. Zheng, Excel Superconductor, Inc. (United States)
Steven E. Giles, Excel Superconductor, Inc. (United States)
Rama Rao, Excel Superconductor, Inc. (United States)
HoiSing Kwok, Excel Superconductor, Inc. (United States)


Published in SPIE Proceedings Vol. 2159:
High-Temperature Superconducting Detectors: Bolometric and Nonbolometric
Michael Nahum; Jean-Claude Villegier, Editor(s)

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