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Proceedings Paper

Fabrication and properties of high-temperature superconducting thin films
Author(s): Hong-Cheng Li
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Paper Abstract

High temperature superconducting thin films of GdBa2Cu3O7 (GBCO) were fabricated by de-magnetron sputtering on SrTiO3, Zr(Y)O2 (YSZ), MgO and LaAlO3 (LAO) single crystal substrates. The X-ray diffraction and TEM analysis showed the films were grown epitaxially with the c-axis perpendicular to the substrates surface. The rocking curves of the film were as narrow as 0.4 degree(s) (FWHM). The zero resistance critical temperature of GBCO could be as high as 92 K, and the critical current density at 77 K and zero field were higher than 3 MA/cm2. The reproducibility is very good. Microwave filters were prepared using the GBCO films on LAO. The maximum insert loss of the low pass filers with upper frequency of 7 GHz at 78 K and the band pass filters with the central frequency of 8.9 GHz and band width of 500 MHz at 77 K were 0.76 dB and 1.9 dB, respectively. The properties of infrared bolometers prepared using GBCO films on YSZ with NEP (noise equivalence power) of 1.2 X 10-11 WHz-1/2, detectivity D* of 4.5 X 109 cmHz1/2/W and responsivity Rv of 1600 V/W have not changed noticeably in the period of half a year with more than 40 warm-cold cycles.

Paper Details

Date Published: 26 October 1994
PDF: 5 pages
Proc. SPIE 2364, Second International Conference on Thin Film Physics and Applications, (26 October 1994); doi: 10.1117/12.190813
Show Author Affiliations
Hong-Cheng Li, National Lab. for Superconductivity (China)

Published in SPIE Proceedings Vol. 2364:
Second International Conference on Thin Film Physics and Applications
Shixun Zhou; Yongling Wang; Yi-Xin Chen; Shuzheng Mao, Editor(s)

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