Title :
Microwave surface resistance measurements of air-atomised spray deposited Tl-Ba-Ca-Cu-O thick films
Author :
Jenkins, A.P. ; Su, L.Y. ; Kale, K.S. ; Goringe, M.J. ; Burgoyne, J.W. ; Dew-Hughes, D. ; Grovenor, C.R.M.
Author_Institution :
Dept. of Mater., Oxford Univ., UK
fDate :
6/1/1995 12:00:00 AM
Abstract :
The surface resistance (R/sub s/) of spray pyrolysed Tl/sub 2/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ thick films on 1 inch diameter finely polished yttria-stabilised zirconia disks has been measured using a TE/sub 011/ mode end-wall-replacement cavity at 20 GHz and 77 K. R/sub s/ values of 5.3 m/spl Omega/ and 1.3 m/spl Omega/ at 20 GHz and 10 GHz (scaled assuming an f/sup 2/ dependence) respectively were obtained. These results are the best recorded R/sub s/ values to date for thick films of any superconductor at the same frequencies and at 77 K. Transport critical current density (J/sub c/) measurements on the films exhibited values of >3/spl times/10/sup 4/ A/cm/sup 2/ at 77 K.<>
Keywords :
barium compounds; calcium compounds; critical current density (superconductivity); high-temperature superconductors; microwave measurement; spray coating techniques; spray coatings; superconducting thin films; surface conductivity; thallium compounds; thick films; 1 in; 1.3 mohm; 10 GHz; 20 GHz; 5.3 mohm; 77 K; TE/sub 011/ mode end-wall-replacement cavity; Tl/sub 2/Ba/sub 2/Ca/sub 2/Cu/sub 3/O; YZrO/sub 2/; YZrO/sub 2/ substrates; air-atomised spray deposited Tl-Ba-Ca-Cu-O thick films; finely polished yttria-stabilised zirconia disks; high temperature superconductors; microwave surface resistance measurements; spray pyrolysed Tl/sub 2/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ thick films; transport critical current density measurements; Critical current density; Electrical resistance measurement; Frequency; Spraying; Superconducting films; Superconducting microwave devices; Surface resistance; Tellurium; Thick films; Thickness measurement;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
