High performance superconducting thin films on large area substrates

The first fabrication of 3-in-diameter, thin films of thallium-based superconductors is reported. (Tl/sub 0.5/Pb/sub 0.5/)Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 9/ thin films on LaAlO/sub 3/ are found to display the best surface resistance (R/sub s/) properties of any superconductor at higher temperatures and show approximately 50* better performance than copper at 100 K and 10 GHz. A Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/ thin film, processed as a 1.8-m-long, 10- mu m-wide meander line carries about 1*10/sup 7/ A/cm/sup 2/ at 4.2 K and 2*10/sup 6/ A/cm/sup 2/ at 80 K. The thallium-based superconductors are compared to YBa/sub 2/Cu/sub 3/O/sub 7/ with respect to T/sub c/, R/sub s/, and Q.<<ETX>>

[1]  J. Talvacchio,et al.  EFFECT OF CU-O LAYER SPACING ON THE MAGNETIC FIELD INDUCED RESISTIVE BROADENING OF HIGH-TEMPERATURE SUPERCONDUCTORS , 1991 .

[2]  W. L. Holstein,et al.  Microstructural and electronic properties of highly oriented Tl/sub 0.5/Pb/sub 0.5/Sr/sub 2/Cu/sub 2/O/sub 7/ films on LaAlO/sub 3/ , 1993, IEEE Transactions on Applied Superconductivity.

[3]  B. Ahn,et al.  Low‐temperature formation of epitaxial Tl2Ca2Ba2Cu3O10 thin films in reduced O2 pressure , 1992 .

[4]  W. L. Holstein,et al.  Epitaxial Tl/sub 2/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ films with very low microwave surface resistance up to 110 K , 1993, IEEE Transactions on Applied Superconductivity.

[5]  R. H. Arendt,et al.  Transport critical currents in spray pyrolyzed films of TlBa2Ca2Cu3Oz on polycrystalline zirconia substrates , 1992 .

[6]  A. Hermann,et al.  Bulk superconductivity at 120 K in the Tl–Ca/Ba–Cu–O system , 1988, Nature.

[7]  D. Murphy,et al.  Bulk superconductivity at 91 K in single-phase oxygen-deficient perovskite Ba2YCu , 1987, Physical review letters.

[8]  L. C. Bourne,et al.  Epitaxial Tl2CaBa2Cu2O8 thin films with low 9.6 GHz surface resistance at high power and above 77 K , 1990 .

[9]  A W Sleight,et al.  Bulk Superconductivity up to 122 K in the Tl-Pb-Sr-Ca-Cu-O System , 1988, Science.

[10]  W. L. Holstein,et al.  Tl2Ba2CaCu2O8 films with very low microwave surface resistance up to 95 K , 1992 .

[11]  R. Howard,et al.  Reproducible technique for fabrication of thin films of high transition temperature superconductors , 1987 .

[12]  N. S. Nogar,et al.  Epitaxial CeO2 films as buffer layers for high‐temperature superconducting thin films , 1991 .

[13]  W. L. Holstein,et al.  High T/sub c/ superconductor and III-V solid state microwave hybrid circuits , 1993, IEEE Transactions on Applied Superconductivity.

[14]  Chu,et al.  Superconductivity at 93 K in a new mixed-phase Yb-Ba-Cu-O compound system at ambient pressure. , 1987, Physical review letters.

[15]  Roger J. Forse,et al.  Measured performance at 77 K of superconducting microstrip resonators and filters , 1991 .

[16]  P. Edwards,et al.  Superconductivity at 124 K in (Tl, Pb)Sr2Ca2Cu3O9 , 1992 .