Abstract
Superconducting epitaxial Tl2Ba2CaCu2O8 (Tl-2212) and Tl2Ba2CuO6 (Tl-22O1) thin films are synthesised on single crystal and bicrystal LaAlO3 substrates by an ex-situ process. Tl-2212 films were optically smooth, with T-c's from 105 to 108K and Delta T-c <2 K, I-c reaching 2.10(6) A/cm(2) at 77 K. Tl-2201 films exhibited tetragonal or orthorhombic symmetry depending on the thallium content. The T-c, of the as-synthesised Tl-2201 films was in the range 40-55 K. By oxygen depletion, T-c was increased by 15 - 20 K. Properties of weak links in Tl-2212 and Tl-2201 thin films are reported.
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