GdBa sub(2)Cu sub(3)O sub(x) for microwave applications. Preparation properties and devices

GdBa sub(2)Cu sub(3)O sub(7) has very similar properties to YBa sub(2)Cu sub(3)O sub(7) but appears to be more tolerant of processing conditions. Thin films prepared by inverted cylindrical magnetron sputtering on MgO single crystals routinely give transition temperatures above 92K and critical curr...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1993-01, Vol.3 (1), p.1733-1736
Main Authors: Jedamzik, D, Trowles, T P, Zammattlo, S J, Stephan, R E, Lamacraft, K, Phillips, W A, Hedges, S J, Adams, M, Nicholson, B F
Format: Article
Language:English
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Summary:GdBa sub(2)Cu sub(3)O sub(7) has very similar properties to YBa sub(2)Cu sub(3)O sub(7) but appears to be more tolerant of processing conditions. Thin films prepared by inverted cylindrical magnetron sputtering on MgO single crystals routinely give transition temperatures above 92K and critical currents above 10 super(6) Acm super(-2) at 77K. Films with areas exceeding 12cm super(2) have been deposited on 0.5mm thick substrates. Structural and compositional studies show a high degree of film perfection. Measurements of surface resistance, using a cavity endwall replacement technique at 60GHz, give values < 20m Omega at 77K (uncorrected for film thickness, typically 0.4-0.5 mu m) and suspended substrate stripline resonators give Q values over an order of magnitude larger than the corresponding gold resonator. A 2% 4GHz filter has been realised in microstrip with a minimum insertion loss below 0.6dB.
ISSN:1051-8223