ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Single phase Tl2Ba2CaCu2O8 thin films have been deposited on single-crystal LaAlO3 substrates, (100) orientation, via a two-step deposition process. First, Ba-Ca-Cu-O precursor films were deposited by metalorganic chemical vapor deposition (MOCVD) using barium, calcium, and copper-tetramethyl-heptanedionate, (tmhd)2, source materials under reduced pressure in an oxygen/argon atmosphere. Substrate temperatures were between 500 and 600 °C. Thallium was then incorporated by heating the films in a confined surface configuration with an unfired pellet of Tl2Ba2CaCu2Ox composition at 870 °C for 0.1 h. The resultant films (0.5–1 μm thick) showed a preferred orientation with the c axis normal to the substrate. The superconducting properties were characterized by resistance and mutual inductance versus temperature and by critical current measurements. Zero resistance temperatures as high as 98 K and Jc values close to 1×104 A/cm2 at 77 K were observed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.105311
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