Published online by Cambridge University Press: 13 December 2006
Tl2Ba2CaCu2Oy (Tl-2212) thin films were fabricated on (001) LaAlO3 substrates by a two-step technique in a semi-closed aluminate crucible and a sealed steel container, respectively. First, the amorphous precursor films were deposited by the pulsed laser deposition (PLD) method, and then they were thalliated in different containers. Almost pure phase Tl-2212 thin films can be prepared in both of the containers. However, the as-annealed films show obvious differences in superconducting properties and microstructure.
Project supported by the National Nature Science Foundation of China (No. 10574154 and No. 10474060), by the Ministry of Science and Technology (No. 2006CB601007) and by Chinese Academy of Sciences.