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/, which has very similar properties to YBa/sub 2/Cu/sub 3/O/sub 7/ but appears to be more tolerant of processing conditions, is studied. Thin films have been prepared by inverted cylindrical magnetron sputtering on MgO single crystals and routinely give transition tempera...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1993-03, Vol.3 (1), p.1733-1736
Main Authors: Jedamzik, D., Trowles, T.P., Zammattio, S.J., Stephan, R.E., Lamacraft, K., Phillips, W.A., Hedges, S.J., Adams, M., Nicholson, B.F.
Format: Article
Language:English
Subjects:
Critical current
Crystals
Electrical resistance measurement
Q measurement
Sputtering
Stripline
Substrates
Surface resistance
Temperature
Thickness measurement
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Summary:GdBa/sub 2/Cu/sub 3/O/sub 7/, which has very similar properties to YBa/sub 2/Cu/sub 3/O/sub 7/ but appears to be more tolerant of processing conditions, is studied. Thin films have been prepared by inverted cylindrical magnetron sputtering on MgO single crystals and routinely give transition temperatures above 92 K and critical currents above 10/sup 6/ A/cm/sup -2/ at 77 K. Films with areas exceeding 12 cm/sup 2/ have been fabricated on 0.5-mm-thick substrates. Structural and compositional studies show a high degree of film perfection. Measurements of surface resistance, using a cavity endwall replacement technique at 60 GHz, give values
ISSN:1051-8223
1558-2515
DOI:10.1109/77.233600